January 2022 - American Institute of Steel Construction

Page created by Mitchell Moss
January 2022 - American Institute of Steel Construction
January 2022
January 2022 - American Institute of Steel Construction
January 2022 - American Institute of Steel Construction
$5,000 ON
                                                  This time, we’re
                                                 looking for the next
                                                great idea to change
                                              the way the industry
                                            approaches column
                                          splices. The key words are
                                         FAST and EASY—to design,
                                       fabricate, and erect safely.

                                    And there’s $5,000 on the
                                line for the best concept. All you
                             need is a spark of inspiration; we’ll take
                        it from there. Your outside-the-box idea
                    could become an open-source, non-proprietary
                   system that will revolutionize the entire industry!

              Deadline: January 14, 2022, 11:59 p.m. CT
January 2022 - American Institute of Steel Construction
January 2022


                                                                                                                                    16      A New Shine on Steel Design
                                                                                                                                            BY NANCY BADDOO, CENG, AND
                                                                                                                                              MARK HOLLAND, PE
                                                                                                                                            A look at the new AISC Specification for
                                                                                                                                            Structural Stainless Steel.

                                                                                                                                    field notes
                                                                                                                                    20      By the Book
                                                                                                                                            INTERVIEW BY GEOFF WEISENBERGER
                                                                                                                                            As one of AISC’s longest-tenured employees,
                                                                                                                                            Cindi Duncan has wrangled countless
                                                                                                                                            committee members to keep publications on
                                                                                                                                            track and on schedule.

                                                                                                                                    business issues
  in every issue                                                                                                                    22      Looking Ahead
                                                                                                                                            A group of construction professionals
                                                                                                                                            ponders the future of the industry and what
   6 EDITOR’S NOTE                                                                                                                          can be done to ensure it’s a bright one.
  61 NEW PRODUCTS                                  resources
  62 NEWS & EVENTS                                 65 ADVERTISER INDEX
  66 STRUCTURALLY SOUND                            65 MARKETPLACE & EMPLOYMENT

features                                                                                                                            conference preview
 26     Early to Rise
                                                                  40      Building for the Future
                                                                          BY BEN LOCKHART
                                                                                                                                    54     Of Codes and Contracts
                                                                                                                                           BY JASON COPLEY, ESQ, AND
        For a new Denver hospital, early                                  A general contractor known for self-                               MATTHEW SKAROFF, ESQ
        coordination allowed for mill order and                           performing concrete work looks to steel to                       Tips for understanding the interplay between
        steel detailing packages to be issued prior to                    frame its new headquarters building in Salt                      contracts and the AISC Code of Standard Practice.
        construction documents. The result?                               Lake City.
        A faster project.                                                                                                           56     Plan the Work, Work the Plan
                                                                                                                                           BY BILL BORCH
                                                                  48      Texas-Sized Steel                                                Thoughts on how to improve erection
 32     Elevating Engineering
                                                                          BY GEORGE R. BATCHA, IV, AND
                                                                            MICHAEL T. KEMPFERT
                                                                                                                                           planning and execution.

        The University of Rhode Island’s new                              A steel producer for which sizable facilities
        engineering building was designed to                              are the norm goes bigger than ever with its               59     Avoiding Surprises
                                                                                                                                           BY BRUCE F. BROTHERSEN, PE
        instigate interdisciplinary interaction.                          new sheet mill in Texas.
                                                                                                                                           Notes on delegated design and the role of the
                                                                                                                                           design professional of record.

ON THE COVER: Steel bracing is on full display at the the University of Rhode Island’s Fascitelli Center, p. 32. (Photo: James Ewing)
MODERN STEEL CONSTRUCTION (Volume 62, Number 1) ISSN (print) 0026-8445: ISSN (online) 1945-0737. Published monthly by the American Institute of Steel
Construction (AISC), 130 E Randolph Street, Suite 2000, Chicago, IL 60601. Subscriptions: Within the U.S.—single issues $6.00; 1 year, $44. Outside the U.S. (Canada and
Mexico)—single issues $9.00; 1 year $88. Periodicals postage paid at Chicago, IL and at additional mailing offices. Postmaster: Please send address changes to MODERN
STEEL CONSTRUCTION, 130 E Randolph Street, Suite 2000, Chicago, IL 60601.
DISCLAIMER: AISC does not approve, disapprove, or guarantee the validity or accuracy of any data, claim, or opinion appearing under a byline or obtained or quoted
                                                                                                                                                                           Printed on paper made
from an acknowledged source. Opinions are those of the writers and AISC is not responsible for any statement made or opinions expressed in MODERN STEEL                      from a minimum of
CONSTRUCTION. All rights reserved. Materials may not be reproduced without written permission, except for noncommercial educational purposes where fewer than 25           10% recycled content.
photocopies are being reproduced. The AISC and Modern Steel logos are registered trademarks of AISC.

4 | JANUARY 2022
January 2022 - American Institute of Steel Construction
January 2022 - American Institute of Steel Construction
editor’s note

                                                                                                      Editorial Offices
                                                                                                      130 E Randolph St, Ste 2000
                                                                                                      Chicago, IL 60601
                                                    Let’s talk about                                  312.670.2400
                                                    fried chicken for a minute.                       Editorial Contacts
                                                                                                      EDITOR AND PUBLISHER
                                                                                                      Scott Melnick
                                                    I live in Chicago and commute                     melnick@aisc.org
                                                    to work via train. My local train                 SENIOR EDITOR
                                                                                                      Geoff Weisenberger
                                                    station is right across the                       312.493.7694
                                                    street from a Popeyes.                            DIRECTOR OF PUBLICATIONS
                                                                                                      Keith A. Grubb, SE, PE
                                                                                                      GRAPHIC DESIGN MANAGER
    Here are two facts, which are in direct         be 200 technical sessions delivered by the        Kristin Hall
conflict with one another. One, I’m one of          best minds in the steel design and construc-      773.636.8543
those people that prefers to patronize local        tion industry. There will be a trade show floor   hall@aisc.org

restaurants and generally avoids chains. Two,       with more than 250 exhibitors. There will         AISC Officers
I love Popeyes, which, of course, is a rather       be the exceedingly popular Thursday night         Stephen H. Knitter
large restaurant chain (there are nearly 3,500      Conference Dinner. There will be keynote          Geiger & Peters, Inc.
locations worldwide).                               addresses and the T.R. Higgins lecture. There     VICE CHAIR
    When I walk by this Popeyes location in         will be opportunities to earn up to 21 PDHs.      Hugh J. McCaffrey
                                                                                                      Southern New Jersey Steel Co.
the morning, it’s closed. But in the evening, it    There will be multiple conferences within a
                                                                                                      SECRETARY/LEGAL COUNSEL
smells magical, and every day, I almost dare        conference: the World Steel Bridge Sympo-         Edward Seglias, Cohen Seglias
myself to wander in the front door and get in       sium, QualityCon, and the NISD Conference         Pallas Greenhall & Furman, PC
line. Of course, I make excuses not to: I should    in Steel Detailing. There may or may not be       PRESIDENT
save money, I should eat at home, there are         fried chicken, but there will likely be green     Charles J. Carter, SE, PE, PhD
better places to get fried chicken (and, let’s be   chile (a popular local addition to Mexican        SENIOR VICE PRESIDENT
                                                                                                      Scott Melnick
honest, fried chicken isn’t exactly the healthi-    food and anything else you might want to
                                                                                                      VICE PRESIDENT
est food in the world anyway), and so on.           slather it on; Google it). And one low regis-     Carly Hurd
    So the compromise is that we get chicken        tration fee gains you access to all of this.      VICE PRESIDENT
(and biscuits and other sides) from Popeyes             And then there are the opportunities          Lawrence F. Kruth, PE
twice a year: once on New Year’s Day (a tra-        to catch up in person with colleagues and         VICE PRESIDENT
dition that somehow started years ago) and          friends, see a new place (or a place you’ve       Brian Raff
once on some random day.                            been before and maybe visit some old              VICE PRESIDENT
                                                                                                      Mark W. Trimble, PE
    My point is that you can always talk            haunts), or simply get a change of scenery that
                                                                                                      Editorial Advisory Panel
yourself into or out of anything. Take work         is fortuitously tied to an event geared toward    Caroline R. Bennett, PE, PhD
conferences, for example. They can seem             making you better at what you do. And keep        University of Kansas
expensive. They can take you or your                in mind that this will be the first in-person     Amanda Dean, PE
employees away from work for a few days.            Steel Conference since 2019—all the more          Walter P Moore
                                                                                                      Bryan Frazier,
And they can seem unnecessary (though               reason for those of us who are still working      Zalk Josephs Fabricators, LLC
ask yourself how many other “unnecessary”           from home all or at part of the time to go.       Keith R. Griesing, PE
things you’ve talked yourself into doing or             And did I mention that it’s in Denver? You    Hardesty and Hanover
buying throughout your life and ended up            may have heard that the Mile High City is         Stephen H. Knitter
being glad you did). But the best ones are          rather fun and is located near lots and lots of   Geiger & Peters, Inc.
investments in your livelihood.                     mountains. Stick around after the conference      Advertising Sales
    Yes, this is the point where I remind you       and make a vacation out of it! As a former        M.J. Mrvica Associates, Inc.
                                                                                                      2 W Taunton Avenue
that NASCC: The Steel Conference is just            Colorado resident, I can assure you there’s       Berlin, NJ 08009
around the corner. This year’s show is taking       plenty to do in the area.                         856.768.9360
place March 23-25 in Denver. Registration               Happy new year, and we look forward to
                                                                                                      Address Changes and
opens on January 10, and you can find out           seeing you in Denver!                             Subscription Concerns
more—and register—at aisc.org/nascc. If                                                               312.670.2401
you’re already planning to attend, great, we’ll
see you there! If you haven’t quite made up                                                           Reprints
                                                                                                      Kristin Hall
your might yet or are in the process of talking                            Geoff Weisenberger         773.636.8543
yourself into it, allow me to help. There will                                        Senior Editor   hall@aisc.org

6 | JANUARY 2022
January 2022 - American Institute of Steel Construction
Better fabrication
starts with SDS2.
The right detailing software can drive efficiency and profitability in your fabrication shop. With SDS2, you can
quickly build and adapt the detailing model to suit your needs, integrate seamlessly with any MRP, MIS and
tracking system, and maximize returns on your automated equipment.

Efficiency, accuracy, results—it all starts with SDS2. Get started today at sds2.com/start.

January 2022 - American Institute of Steel Construction
Scooping up
the PDHs
AISC Continuing Education

Education Archives
Did you know that AISC offers 30-minute to 6-hour
presentations on demand? Viewing is free—so grab some
hot chocolate (extra marshmallows!) and check them out!
  And if PDHs are what you’re after, you can purchase,
take, and pass a quiz to earn a certificate. There are
over 200 hours of options to choose from.

                                                          Smarter. Stronger. Steel.
                                                          American Institute of Steel Construction
                                                          312.670.2400 | www.aisc.org
January 2022 - American Institute of Steel Construction
steel interchange
If you’ve ever asked yourself “Why?” about something related to structural steel
design or construction, Modern Steel’s monthly Steel Interchange is for you!
Send your questions or comments to solutions@aisc.org.

All mentioned AISC codes, standards, or
manuals, unless noted otherwise, refer to
the current version and are available at

Strengthening Existing
I have a question about dealing with the
pre-load in an existing column that is to
be reinforced by adding plates. The AISC
2013 webinar “Design of Reinforcement
for Steel Members” (which you can
access at aisc.org/educationarchives;
note that PDHs are available) indicates,
on slides 42 and 43, that whether the
reinforcement is stabilizing or non-
stabilizing should be considered.
   Is the concept of stabilizing and
non-stabilizing reinforcement valid,
and what is the source for the limit on
the reinforced radius of gyration?

Pre-load does reduce the strength of
columns. However, this detrimental effect
can be partially or wholly offset by other
beneficial effects. For some conditions,
safe designs can be obtained with the
equations in AISC Specification Section E3,
which define the AISC Column Curve
(curve expressing the relationship between
flexural buckling and slenderness ratio). In
this case, a safe design can be defined as
the condition where the beneficial effects
equal or exceed the detrimental effects.
I developed the design guidance in the
2013 webinar based on an evaluation of the
available research. (Although I am planning
to write an AISC Engineering Journal
article, it has taken longer than expected.)
    Residual stresses are self-equilibrating
stresses built into the member in the
unstressed condition (no applied load).
Due to uneven cooling after the rolling
process, all steel shapes have residual
stresses. I-shaped members usually have
compression residual stresses at the
flange tips. Although the magnitude can
vary significantly, they are often assumed

                                                                       Modern Steel Construction | 9
January 2022 - American Institute of Steel Construction
steel interchange

to be about 30% to 40% of the yield              load. The beneficial effects are the residual                axis. The differences are caused by shape
stress. Longitudinal fillet welds cause          welding stresses and the locked-in tension                   factors, geometric imperfections, and
residual tension stresses in the connected       stresses caused by the pre-load.                             material imperfections (including residual
members near the weld. These stresses are            Pre-load does not affect buckling                        stresses). The AISC Column Curve is a
approximately equal to the yield stress of       in the elastic range. However, the yield                     lower-bound curve based on a statistical
the base metal.                                  point in compression is dependent on the                     analysis of many shapes. Many of the
   The locked-in stresses caused by              magnitude of the locked-in compression                       shapes included in the analysis had residual
the pre-load can be considered residual          stresses. This is important because any                      compression stresses at the flange tips,
compression stresses acting on the original      yielding causes a significant reduction                      which is the most detrimental location.
cross-section. Because the reinforcing plates    in buckling strength compared to the                         For non-preloaded columns with welding
are unstressed (excluding residual stresses)     elastic section. For a given (non-slender)                   residual stresses near the flange tips, the
until an additional load is added to the         column geometry, the flexural stiffness                      AISC Column Curve is conservative.
reinforced column, the plates effectively        about the buckling axis is the primary                          After reviewing the available research,
have locked-in tension stresses caused by        variable affecting the buckling strength.                    I determined that when rr ≤ 0.85ro, the
the pre-load. Conceptually, this is clearer if   When a portion of the column yields, that                    AISC Column curve is appropriate for
we think about the stresses in the reinforced    yielded portion can be assumed to have                       designing field-welded and pre-loaded
member if the pre-load is removed after the      a negligible contribution to the flexural                    columns. This applies only to doubly
reinforcing plates are welded.                   stiffness of the cross-section. Therefore,                   symmetric shapes with a controlling limit
   If everything else is equal, including        inelastic columns are more efficient when                    state of flexural buckling. In practice, I
the initial out-of-straightness of the           the elastic areas are located farthest from                  had used this method on several projects,
column, the beneficial and detrimental           the centroid of the reinforced section.                      even before it was presented in the 2013
effects can be evaluated based on the                All steel shapes have different column                   webinar. Ultimately, you must use your
locked-in stresses. The detrimental effects      curves that define the flexural buckling                     judgment to determine what is appropriate
are the residual compression stresses and        strength. For many shapes, the buckling                      for your situation.
the locked-in stresses caused by the pre-        curve is also dependent on the buckling                                            Bo Dowswell, PE, PhD

Weak-axis Shear in a Wide Flange Member
I am using Equation G6-1 of the 2016                I believe the provision is presented                      elements,” and each of these elements
AISC Specification for Structural Steel          the way it is because “doubly and singly                     may or may not have identical
Buildings (ANSI/AISC 360), but I am              symmetric shapes” could include one,                         dimensions (tf, bf).
not sure I am using it correctly. Even           two, three, or more “shear resisting                                                 Larry Muir, PE
though the wide-flange member is doubly
symmetric, the equation only seems
to allow me to account for the shear
strength of a single flange? Why can’t we
consider the strength of both flanges?

You have misunderstood the intent.
Equation (G6-1) provides “…the nominal
shear strength, Vn, for each shear resisting
element…” It is not intended that you use
“the strength of just one flange element”
as you have interpreted the requirement.
You can use both flange elements.

Bo Dowswell, principal with ARC                                                                               The opinions expressed in Steel Interchange do not
                                                                                                              necessarily represent an official position of the American
International, LLC, and Larry Muir                                                                            Institute of Steel Construction and have not been reviewed.
are both consultants to AISC.                                                                                 It is recognized that the design of structures is within the
                                                 Steel Interchange is a forum to exchange useful and          scope and expertise of a competent licensed structural
                                                 practical professional ideas and information on all phases   engineer, architect or other licensed professional for the
                                                 of steel building and bridge construction. Contact Steel     application of principles to a particular structure.
                                                 Interchange with questions or responses via AISC’s Steel     The complete collection of Steel Interchange questions and
                                                 Solutions Center: 866.ASK.AISC | solutions@aisc.org          answers is available online at www.modernsteel.com.

10 | JANUARY 2022
Better Together
        Bone up on steel design with your very own copies of the
            15th Edition Steel Construction Manual and the
                  3rd Edition Seismic Design Manual


        Learn more about these great AISC steel design resources
           at aisc.org/manualresources and aisc.org/seismic.

 aisc.org/publications | 800.644.2400
steel quiz
AISC turned 100 in 2021, and this month’s Steel Quiz takes a look at steel structures
from the past century. Learn more at aisc.org/legacy.

1 Proving to be stronger and more        2 What earthquake forever changed         3 What building took the title from the
   weldable than its predecessor, A-7,     the way steel structures are designed     Empire State Building as the world’s
   what year was A-36 introduced?          and fabricated?                           tallest building?
   a. 1962                c. 1960          a. Loma Prieta          c. El Centro      a. World Trade Center
   b. 1966                d. 1964          b. Northridge           d. Napa           b. John Hancock Center (aka 875
                                                                                         North Michigan Avenue)
                                                                                     c. Sears Tower (now Willis Tower)
                                                                                     d. Salesforce Tower
                                                                                   4 What iconic steel structure was built
                                                                                     for a World’s Fair?
                                                                                     a. John Hancock Center
                                                                                     b. Space Needle
                                                                                     c. Citigroup Building
                                                                                     d. Sears Tower
                                                                                   5 Which U.S. President has their name
                                                                                     on a bridge in Louisville? (Hint:
                                                                                     Check the 1960s.)
                                                                                     a. Richard Nixon
                                                                                     b. Franklin Roosevelt
                                                                                     c. John F. Kennedy
                                                                                     d. Lyndon B. Johnson
                                                                                   6 What bridge has the 17th longest
                                                                                     main span in the world and longest in
                                                                                     the Americas?
                                                                                     a. Verrazano-Narrows Bridge
                                                                                     b. Rio Grande Gorge Bridge
                                                                                     c. Mackinac Bridge
                                                                                     d. Throgs Neck Bridge
                                                                                   7 What steel structure completed in
                                                                                     1969 contains striking X-shaped
                                                                                     exterior bracing?
                                                                                     a. Sears Tower
                                                                                     b. World Trade Center
                                                                                     c. One Liberty Place
                                                                                     d. John Hancock Center
                                                                                   8 What issue endangered the
                                                                                     Citigroup Center in New York? (Hint:
                                                                                     Check the 1970s.)
                                                                                     a. Underestimated seismic loads
                                                                                     b. Miscalculated wind loads
                                                                                     c. Potential liquefaction
                                                                                     d. Faulty fabrication
                                                                                   9 What steel was adopted in 1999 as the
                                                                                     new go-to material for rolled shapes?
                                                                                     a. ASTM A572 Grade 50
                                                                                     b. ASTM A500 Grade B
                                                                                     c. ASTM A992
                                                                                     d. ASTM A588

                                                                                     TURN TO PAGE 14 FOR THE ANSWERS
12 | JANUARY 2022
steel quiz               ANSWERS

                                          1 c. A-36 was introduced in 1960 at the      6 a. New York’s Verrazzano-Narrows
                                             National Engineering Conference.             Bridge’s upper level opened in 1964,
                                                                                          the lower level in 1969.
                                          2 b. The 1994 Northridge, Calif., earth-
                                             quake spurred extensive research          7 d. The John Hancock Center (now
                                             and work, leading to the develop-            875 North Michigan Avenue) is the
                                             ment of the AISC Seismic Provisions          fourth-tallest building in Chicago.
                                             for Structural Steel Buildings (ANSI/
                                             AISC 341, aisc.org/specifications).
                                                                                       8 b. Wind loads were deemed an issue
                                                                                          and corrected after a student raised a
                                          3 a. The World Trade Center in Man-             question to the building’s chief engi-
                                             hattan used a novel system that              neer. (See the People to Know item
                                             relied on exterior walls to support the      “Delayed Reaction” in the October
                                             structure.                                   2012 issue, available in the Archives
                                                                                          section at www.modernsteel.com.)
                                          4 b. Seattle’s Space Needle followed
                                             the theme of “The Age of Space”           9 c. ASTM A992 has been the pre-
                                             and was initially designed to with-          ferred material specification for hot-
                                             stand large earthquakes.                     rolled shapes since its adoption.
                                          5 c. While still unnamed when Presi-
                                             dent Kennedy was assassinated,
                                             the bridge was later named the                Everyone is welcome to submit questions
                                             John F. Kennedy Memorial Bridge               and answers for the Steel Quiz. If you
                                                                                           are interested in submitting one question
                                             in his honor.
                                                                                           or an entire quiz, contact AISC’s Steel
 Chicago’s John Hancock Center is known
                                                                                           Solutions Center at 866.ASK.AISC or
 for its steel exterior X-bracing.

                                                         603-402-3055 • Automated Layout Technology™
                                                               Visit AUTOMATEDLAYOUT.COM for a Quote

                                                      The first automated marking machine created specifically
                                                      for the layout of commercial handrails, stair stringers and
                                                      so much more utilizing your steel detailer’s dxf files.
                                                         •   Cut Fabrication Time by More Than 50%
   “It easily doubles our output – no mistakes”          •   Ensure the Highest Level of Accuracy
   Plant Manager • Papp Iron Works                       •   Boost Your Profit Margins!
                                                         •   Lay out complex geometry in seconds
   One current customer’s team can layout 26 stair
                                                         •   Designed to replace your existing fabrication table
   stringers in 58 minutes and ended up purchasing
   another machine for their second location.
                                                             “The guys love it. They jumped right in on it and have been
                                                             working to make the most use of it. Great purchase.”
                                                             Nat Killpatrick • Basden Steel Corporation

                                                             “I think it’s fair to say that this machine continues to
                                                             exceed our expectations. We are very happy with it.”
                                                             Chief Operating Officer • Koenig Iron Works

                                                             “The machine is fantastic and could not be happier.
                                                             Keep selling this machine, it’s a winner.”
                                                             Misc. Shop Foreman • Koenig Iron Works

14 | JANUARY 2022
Quality Management
Company, LLC (QMC)
is seeking qualified
to conduct site audits for
the American Institute of
Steel Construction (AISC)
Certified Fabricators and
Certified Erector Programs.

This contract requires travel
throughout North America and
limited International travel.
This is not a regionally based
contract and a minimum of 75%
travel should be expected.
Contract auditors must have
knowledge of quality management
systems, audit principles and
techniques. Knowledge of the
structural steel construction industry
quality management systems is
preferred but not required as is
certifications for CWI, CQA, or
NDT. Prior or current auditing
experience or auditing certifications
are preferred but not required.

Interested contractors
should submit a statement
of interest and resume to

A New Shine on Steel Design

A look at the new AISC Specification for Structural Stainless Steel.

                                                                                                                           Premier Industrial/Westinghouse

                                                                                                      A stainless steel support structure was used
                                                                                               for the passive cooling system in the containment
                                                                                      structure at the Vogtle Nuclear Power Plant (Units 3 and 4)
                                                                                    in Burke County, Ga. The tower is 30 ft tall and 11 ft square,
                                                                                   and made from duplex stainless steel S32101 plate and HSS.

AS THE DEMAND for resilient, long-               for the Design of Cold-Formed Stainless Steel       following is a brief look into the new publi-
lasting structures with low maintenance          Structural Members—has been around for              cation and how it harmonizes with the 2016
requirements grows, so does the demand           decades, there wasn’t a dedicated publica-          AISC Specification for Structural Steel Buildings
for stainless steel in construction—and          tion for welded and hot-rolled stainless            (ANSI/AISC 360-16); both publications can
AISC has recently released a specification       steel products until AISC published the             be found at aisc.org/specifications.
dedicated to structural stainless steel.         first edition of Design Guide 27: Structural
    Stainless steels are attractive and highly   Stainless Steel in 2013 (aisc.org/dg).              Stainless Applications
corrosion-resistant steel alloys with favor-         Subsequent interest from the industry               First, it’s important to consider where
able strength, toughness, and fatigue char-      spurred AISC to develop a specification             structural stainless steel can be most useful
acteristics. They can be fabricated using a      dedicated to structural stainless steel. Work       or make the most sense. Prominent stainless
wide range of commonly available engi-           began with the establishment of the AISC            steel applications include external structural
neering techniques and, like traditional         Committee on Structural Stainless Steel,            members that are in close proximity to salt-
structural steel, are fully recyclable at the    which includes stainless steel fabricators and      water, exposed to deicing salts, or in heavily
end of their useful life.                        welding experts, metallurgists, designers, and      polluted locations. Stainless steels are com-
    While guidance for designing cold-           academics. And the new publication, Speci-          monly used for platforms, barriers, and equip-
formed structural stainless steel members—       fication for Structural Stainless Steel Buildings   ment supports for the water treatment, flood
in the form of ASCE/SEI 8-02: Specification      (ANSI/AISC 370-21), is now available. The           control, pulp and paper, nuclear, biomass,
16 | JANUARY 2022
                                                                                                                    Chattanooga Boiler and Tank Company

 Stainless steel is increasingly being used for transit-related structures.
 Over the last 12 years, curved stainless steel and glass canopies have
 been installed over the entrances to 40 Washington, D.C., Metro
 stations. The canopies adopt a modular design and are made up of
 austenitic stainless steel S31603 rectangular HSS.

chemical, pharmaceutical, and food and bev-        and the first stage of the design process        supplemental seismic provisions available
erage industries. In such applications, elimi-     should involve characterizing the service        for stainless steel. The new publication’s
nating the need for coating maintenance or         environment. The publication’s Commen-           provisions apply to austenitic and duplex
component replacement due to corrosion can         tary provides guidance in this area, and         stainless steels, and some provisions are
result in significant long-term maintenance        AISC Design Guide 27 also advises on the         also given on the use of precipitation hard-
cost savings. Stainless steel structural compo-    durability of different stainless steel alloys   ening stainless steels for tension members,
nents are also a popular choice for cladding       in various environments.                         fittings, and fasteners.
supports, roofs, canopy supports, security bar-                                                         Chapters A through N of the Stainless
riers, and other applications that take advan-     Synching Up                                      Specification mirror the equivalent chapters in
tage of the material’s corrosion resistance,           The scope of the Stainless Specification     the AISC Specification. The one exception is
strength, and fire resistance to reduce mainte-     generally matches the scope of the AISC         Chapter I, which currently serves as a place-
nance requirements and improve safety.              Specification. Although structural stainless    holder to retain the same chapter letters as
    Choosing the correct stainless steel            steel has some promising properties for         the AISC Specification while design rules are
alloy for a specific application is crucial,        seismic applications, there are currently no    developed for inclusion in a later edition.

                                                                                                                                     Stainless Structurals

Stainless steel S31603 laser-welded sharp-cornered HSS, wide-flange beams, and angles were used as structural members for the glazed
entrance structures and elevator shafts as part of the renovation of the Southeastern Pennsylvania Transportation Authority (SEPTA) station at
30th Street in Philadelphia.
                                                                                                                      Modern Steel Construction | 17
                                                                                                                                                Silverstein Properties

The high-strength duplex stainless steel S32205 mullions in the glazed façade of the 60-ft-tall three-sided atrium to 3 World Trade Center are sharp-
cornered profiles of built-up structural tube, which was selected for its resilient design characteristics and excellent corrosion resistance.

    Although the necessary steps to deter-                             assessment requirements for specifying       • Chapter H gives the same interaction
mine the structural capacity of stainless steel                        corrosion resistance.                          expressions as those in the AISC
members and connections are very similar                           •   In Chapter B, the limiting width-to-           Specification.
to those of carbon steel, the nonlinear stress-                        thickness ratios are generally lower than    • The Chapter J rules for determining the
strain characteristics of stainless steel impact                       the equivalent values in the AISC Speci-       available strength of connections are
certain aspects of structural behavior—e.g.,                           fication and are organized into fewer cat-     generally the same as those in the AISC
local and global buckling response. A com-                             egories. A method is provided for deter-       Specification, apart from the provisions
parison of the Stainless Specification and the                         mining the strength increase in stainless      for bearing strength and slip-critical
AISC Specification is summarized here:                                 steel cold-formed hollow structural sec-       connections.
 • In addition to applicable material                                  tions (HSS) due to strain hardening.         • The Chapter K provisions are the
    specifications, Chapter A of the Stain-                        •   There are some differences in the rules        same in both specifications, except the
    less Specification provides product order                          for stability in Chapter C.                    scope of this chapter in the Stainless
    requirements, as well as minimum                               •   In Chapter D, the provisions are gen-          Specification is limited to square or
                                                                       erally the same as the AISC Specification,     round HSS and box sections of uniform
                                                                       although there is specific guidance for        wall thickness.
                                                                       stainless steel members where deforma-       • In Chapter L, the nonlinear character-
                                                                       tion needs to be limited.                      istics of stainless steels mean it is nec-
                                                                   •   The Chapter E expressions for determin-        essary to use the secant modulus, as
        ANSI/AISC 370-21
        An American National Standard                                  ing the flexural buckling strength differ      opposed to the modulus of elasticity, for
        Specification for                                              from those in the AISC Specification.          estimating deflections.
        Structural Stainless                                       •   The Chapter F expressions for deter-         • Chapter M contains some different
        Steel Buildings                                                mining the lateral-torsional buckling          provisions that are necessary due to
                                                                       strength differ from those in the AISC         the different chemical compositions of
         June 11, 2021
         Approved by the Committee on
                                      Structural Stainless Steel
                                                                       Specification.                                 stainless steels compared to carbon steel.
                                                                   •   In Chapter G, the provisions for shear         Storage and handling measures to avoid
                                                                       are generally the same as those in             surface-finish damage are also given.
                                                                       the AISC Specification, apart from the       • In Chapter N, the requirements for
                                                                       expression for calculating the web shear       inspection and testing of welding in
                                                                       strength coefficients. Provisions for tor-     accordance with AWS D1.6/D1.6M
                                                                       sion are given in Chapter G, as opposed        replace those for carbon steel, where
                                                                       to Chapter H.                                  AWS D1.1/D1.1M is referenced in the
                                                                                                                      AISC Specification.

18 | JANUARY 2022
 • There are some differences in the rules          Inside Stainless Steel
    for design by advanced analysis given in        Stainless steels are a family of corrosion- and heat-resistant steels containing a mini-
    Appendix 1.                                     mum of 10.5% chromium and a maximum of 1.2% carbon. There is a wide range of
 • Appendix 2 gives a deformation-based             stainless steels with varying levels of corrosion resistance, strength, and weldability.
    design method for determining the               This array of properties is the result of controlled alloying element additions, each
    strength of stainless steel cross sections,     affecting specific mechanical properties and the ability to resist different corrosive
    considering the benefits of strain hard-        environments.
    ening. It offers an alternative and less           With a combination of a minimum chromium content of 10.5%, a clean surface,
    conservative way of determining mem-            and exposure to air, a transparent and tightly adherent layer of chromium-rich oxide
    ber available strengths to the traditional      forms spontaneously on the surface of stainless steel. If scratching or cutting dam-
    methods given in Chapters D, E, F, and          ages the film, it reforms immediately in the presence of oxygen. As long as the
    H of the Stainless Specification.               stainless steel alloy is corrosion-resistant enough for the service environment, it will
 • The provisions regarding fatigue in              not react further with the atmosphere. No applied coatings are necessary through-
    Appendix 3 are the same as those in             out the lifetime of a component.
    the AISC Specification, although certain           Stainless steel components are available in a range of finishes, from a standard
    detail classes are removed as they fall         mill finish suitable for applications where cosmetic appearance is less important to
    outside the scope.                              brushed, polished, and even colored finishes for architectural applications.
 • For fire design in Appendix 4, the
    strength and stiffness degradation fac-
    tors and the expressions for determining
    the nominal compressive and flexural
    strength for design by simple methods
    of analysis are different from those in
    the AISC Specification.
 • In Appendix 5, the same procedures
    apply to evaluating existing structures
    as those in the AISC Specification.
 • The provisions in Appendix 6 for the
    required strength of bracing members
    are different than those in the AISC
 • Appendix 7 gives the expressions for
    modeling material behavior for stainless
    steel at room temperature and elevated
    Note that the Stainless Specification is a                                                                                  Stainless Structurals
standalone document with its own code of
standard practice, Code of Standard Practice for
Structural Stainless Steel (AISC 313-21); next
month’s SteelWise will provide information
on this forthcoming publication. In addition,
the second edition of Design Guide 27 will
be published at the same time as the Stain-                                               Nancy Baddoo (n.baddoo@steel-sci.com)
less Specification to serve as its “handbook,”                                            is an associate director with the Steel
providing examples and section property                                                   Construction Institute in the United Kingdom.
and member capacity tables for a range of                                                 She and her SCI colleague Francisco Meza
structural sections. (At present, there is no                                             prepared the first draft of the AISC Specification
U.S. specification giving a standard library of                                           for Structural Stainless Steel Buildings and are
sizes of stainless steel sections for structural                                          also joint authors of the second edition of AISC
applications, so the tables cover the range of                                            Design Guide 27: Structural Stainless Steel,
practical section sizes in typical use.)                                                  which is expected to be published later this year.
    With the new stainless steel standard, its                                            Mark Holland (mholland@pvsteel.com) is
related code, and the updated stainless design                                            chief engineer at Paxton and Vierling Steel Co.
guide at their fingertips, designers will be able                                         and chairs the AISC 370 Committee for
to design economic stainless steel structures                                             Structural Stainless Steel.
with long service lives and low maintenance
requirements and, generally, get the most out
of their stainless steel projects.             ■

                                                                                                                  Modern Steel Construction | 19
field notes

By the Book

As one of AISC’s longest-tenured employees, Cindi Duncan has wrangled countless
committee members to keep publications on track and on schedule.

CINDI DUNCAN HAS SEEN a lot of                various committees to keep AISC’s publi-       up changing my direction to architectural
changes to the steel construction industry    cations on schedule, her advice to the next    engineering in the middle of my junior year.
over the years—not to mention a lot of        generation of female engineers, and more.
standards.                                                                                   What made you change your major/focus?
   AISC’s longtime director of engineering    Where are you from, and where did you             I’d taken a lot of liberal arts classes and
has spent much of her nearly three decades    grow up?                                       really enjoyed that, but then one day I real-
here guiding the development of our many         I grew up in Osceola, Iowa. I had a fairly ized how expensive it was to go to medical
standards and manuals (and sometimes          modest upbringing in a blue-collar family, school. My parents worked really hard for
Design Guides and Engineering Journal),       but my dad worked hard to move up to a me to go to college. They always supported
encouraging the process’ evolution as well    sales position for a linen company and then me even though they didn’t have that same
as being part of the evolution of the engi-   eventually changed careers and owned his experience, and I knew they couldn’t help
neering profession itself.                    own business. My mom helped him and support me through a medical school edu-
   As she nears retirement later this year,   also sold real estate. Neither of my parents cation. I really enjoyed the sciences, and my
she reflects on how she got into the con-     has a college degree. I’m the third of four roommate’s dad owned a structural engi-
struction world (after taking a detour from   children and ended up being the first in the neering company in Denver, and I thought,
an early pre-med path), how she’s been        family to get a college degree.               “Oh, that sounds really interesting, designing
able to bring disparate parties together on                                                  buildings and constructing them.” And I
                                              That’s great! On that note, where did changed to architectural engineering at that
                                              you go to school (college)?                    point and ended up getting a bachelor of sci-
                     Field Notes is Modern        Starting in middle school, when I took ence in that field from CU. And then I went
                     Steel Construction’s     my first biology class, I wanted to be a doc- on to get a master of engineering degree
                     podcast series, where    tor. So I started out at the University of (civil-structures) from Cornell University.
                     we interview people      Iowa in pre-med/liberal arts classes. After
                     from all corners of      two years, I transferred to the University That’s quite the change in direction!
                     the structural steel     of Colorado-Boulder, mainly because my How did you get started at AISC?
industry with interesting stories to tell.    family moved to Colorado, and it was a            After getting my bachelor’s degree,
Listen in at modernsteel.com/podcasts.        good excuse to get out of Iowa. I ended I worked in Toledo, Ohio, as a project

20 | JANUARY 2022
field notes
engineer at the Lathrop Company. I was            fabricators, producers, educators, and con-         than men at AISC. It is good that AISC is
working in a field trailer and joined the         sulting engineers, so you can imagine the           now hiring women engineers regularly
project when they were drilling caissons,         disagreements that may come up. When I              now—but I think the percentage of women
and I remember wearing tall rubber boots          first came to AISC in the mid-1980s, the big        going into civil engineering in general
and getting stuck in the mud trying to walk       debate I recall was related to which column         compared to men has stayed about the same
around to review the project. I was not           curve to adopt in the new LRFD Specification.       since the mid-1980s for various reasons.
excited about being in the field, nor the         This debate was primarily between educa-
lack of respect I experienced due to being        tors, and you may be surprised how passion-         What advice do you have for young
a female, so I went back to school after a        ate they were about their related research. It      women looking to get into engineering
year and a half, and that’s when I got my         is interesting what can cause a heated debate,      or construction in general?
master’s degree in civil engineering/struc-       from italicizing glossary terms in the specifi-         I suggest getting as much education in
tures. And then I ended up in Chicago as          cation to whether to remove ASD and have            your field as you can, including a master’s
my husband at the time took a job there.          only the LRFD method of design. This has            degree, then getting licensed as soon as you
I actually answered a Chicago Tribune ad          been the most recent debate.                        are eligible. I made the mistake of letting
for a staff engineer position at AISC and             I think in general, the technical debates       life get in the way and put off my registra-
interviewed with Dr. Geerhard Haaijer,            have been less volatile in the past 15 years        tion, which made it very difficult to pass the
who was the vice president of engineering         or so because most of the AISC standards            licensure exams, especially since I have spent
and research at the time. I always say I got      are now ANSI-approved, meaning that the             minimal time in my career doing design.
the job because he knew my steel professor,       consensus bodies approving the standards
William McGuire, at Cornell.                      have to be balanced with equal parts industry,      You’re planning to retire later this year.
                                                  general interest, academia, and consulting          What are you looking most forward to
How long have you been at AISC?                   engineers, and they have to follow a very           when it comes to retirement?
   I started at AISC in 1985, left in 1992        defined process, requiring 75% approval of a           My time will be my own, all of the time!
to stay at home and raise my kids, and then       revision, and all negatives have to be fully vet-   I can sit down and play the piano when-
returned in 1997 and basically picked up          ted and responded to. If a negative is found        ever I like and spend all day learning a new
where I left off. Somewhere along the line,       non-persuasive and the voter doesn’t wish           piece if I wish. I can help my aging parents
I was promoted to senior engineer and then        to remove the objection, the negative com-          out or spend the day with my grandson. I
director of engineering. I have had various       ment/responses have to be circulated and the        would also like to make more quilts. I made
roles through the years, including secretary      pertinent revision recirculated, allowing the       my first quilt for my grandson when he was
of different task committees, from nuclear        full committee to vote again.                       born. And I’d like to help my mother write
design to seismic design, and I currently                                                             her memoirs and publish them. I have an
serve as secretary of the Committee on            I’m glad the volatility has lessened. Back          interest in writing a book, too, just not sure
Specifications, Committee on Manuals, and         to your history at AISC, I understand               what topic yet!                              ■
Committee on Structural Stainless Steel. I        that you were the first female engineer
have also been editor of Engineering Journal      hired here. Can you talk a bit about that           This column was excerpted from my conver-
and directly responsible for the develop-         experience?                                         sation with Cindi. To hear more about her,
ment of AISC’s Design Guides in the past.             For the first seven years of my tenure at       including her musical skills, her thoughts on
                                                  AISC, I am fairly sure I was the only female        green and red chile, and her favorite things
Can you tell me one of your biggest suc-          at the committee meetings. It is something          about Chicago and Santa Fe (she splits time
cess stories in terms of working on an            I got used to and was already used to since         between the two and will be spending a lot
AISC publication?                                 most of my classmates were men. I have to           more time in one of them after she retires),
   Most of my work has been involved in           admit there were occasional sexist or chau-         check out the January Field Notes podcast at
developing and preparing AISC standards           vinistic remarks from my male colleagues            modernsteel.com/podcasts.
and manuals for publication. There isn’t          at AISC, as well as the committee members.
any one story that stands out, but the fact       I doubt that most of them were meant to be
that they come out on time (they’re sched-        malicious, but I have never forgotten most
uled six years in advance) is a big success       of the comments. They stick with you.
story every time it happens—especially
since the AISC Specification and Seismic          I can imagine. Have things changed
Provisions, in particular, have to be available   much in terms of women joining and
by a specific time in order to be adopted in      being more accepted in engineering
ASCE 7 and the International Building Code.       and construction in general?
                                                     After I returned to AISC in 1997, there
Have you witnessed some interesting or            seemed to be a change in direction and pos-
heated discussions when it comes to a             sibly a change in upper management so that
committee or a particular publication?            finally, more women engineers were hired.           Geoff Weisenberger
   This happens often. Our commit-                At one point in the last ten years or so, I         (weisenberger@aisc.org) is senior
tees have a mix of industry folks, such as        believe we have had more women engineers            editor of Modern Steel Construction.

                                                                                                                       Modern Steel Construction | 21
business issues

Looking Ahead
A group of construction professionals ponders the future of the industry and
what can be done to ensure it’s a bright one.

IT’S NEVER TOO EARLY to think about              “The goal is to empower young lead-       specifically on challenges that can create
the future—and an unjaded perspective         ers that are not yet fatally infected with   resistance to change throughout the pro-
can help expand the range of possibilities.   the ‘I-do-not-trust-you’ bug to describe     cess. These include issues such as mistrust
   That’s the mindset of a new panel          a desirable future state for the construc-   between team members, lack of transpar-
of young design and construction pro-         tion industry,” summarized Marc Dutil,       ency between owners and stakeholders,
fessionals. Initiated by AISC member          president and CEO of Canam Group,            and short-term thinking. The group
fabricator Canam Group, the Future            who helped launch the program.               wholeheartedly believes these are solvable
Leaders Program (FLP) gathers young               Over the last two years, the group’s     challenges and that now is the time for
leaders (under the age of 40) from various    participants have worked to identify the     open dialogue, interdisciplinary trust, and
branches of the architecture, engineer-       most challenging and frustrating issues      collaboration, and the goal is to shift the
ing, and construction (AEC) industry for      in the construction process—many of          collective mindset of the AEC industry to
open discussions about the state of the       which can be traced back to the early        improve relationships and create better
industry and where it is headed.              stages of projects—and have narrowed in      outcomes for clients and project teams.

22 | JANUARY 2022
business issues
    A recent panel discussion facilitated by   Should owners ask for more collaboration            According to Erdy, ‘’It’s really about
the FLP leaders featured four highly suc-      between designers and contractors (gen-          trust and how much you trust the team;
cessful professionals representing various     erals and subs) during design?                   that’s the fundamental road to success.’’
construction disciplines, with many years          The panel was unanimous that owners             Tessier also added that there is a prob-
of industry experience and varied project      should ask for more collaboration.               lem in the construction industry: a lack
types between them:                                Frodyma said, “Yes, it’s important and if    of collaboration and communication. To
   • Scott Erdy, Lead Design Principal,        you are not doing it, you should because         improve collaboration, he stressed, the
      Erdy McHenry Architects                  you’ll save time, you’ll weed out mistakes       project team needs to create open lines of
   • Janis Vacca, Principal, The Harman        in design and make your building more            communication and make sure that every-
      Group                                    efficient, cost-effective, etc.’’                one can bring their best ideas forward.
   • Daniel Tessier, Vice President,               Collaboration early on is important, ide-
      AECOM Tishman                            ally with consultants, contractors, and client   Do you think the emergence of new tools
   • Robert Frodyma, Vice President of         involvement, because trusting the team is the    and technology—e.g., BIM, 4D schedul-
      Design and Construction, Canadian        key, noted Vacca. “You can build that trust      ing (combining a traditional construction
      Tire Real Estate Limited                 working together with the same purpose:          schedule with a 3D model), and modular
    Together, they answered some key ques-     doing what’s best for the project and under-     construction—is enough to help the indus-
tions about where the industry is headed       standing the actual project priorities. When     try keep up with the fast pace of today’s
and how to drive positive change. The          everyone works together from the start, com-     construction? What does the construction
following feedback was summarized by           municates and listens to each other, you can     industry need to change to ensure quality
members of the FLP team.                       understand their diverse perspectives.”          and efficiency are maintained?

                                                                                                                Modern Steel Construction | 23
business issues

Scott Erdy             Again, there was unanimous agree- trained and educated on soft skills in
                    ment amongst the panel that technology schools, with communication and people
                    will increase speed and agility to deliver skills being a top priority. We should be
                    construction projects more efficiently. pushing to integrate more of this train-
                    Vacca pointed out, “Let’s be honest, the ing into our education programs. There
                    number one stressor for everyone is is also the issue of fear: fear of not know-
                    money. Technology can impact the speed ing and fear of asking questions. We need
                    of delivery which ultimately correlates to to cultivate a climate where people feel
                    financial savings.”                           comfortable and safe in asking questions,
                        Erdy suggested that the best option in asking for help, and in looking to the
                    is where there is a collaborative relation- younger generation to help answer tech-
                    ship where models are shared in real time. nological questions.
                    However, the industry is very diverse in
                    the technology used by different-sized What would be the best advice to an
                    companies as well as different trades. “Our owner before selecting the project team
                    schools need to do a better job in teaching and the type of contract/bidding for
                    the new generation the technology and construction?
                    tools that will provide a common language        Tessier’s advice was to be sure to select
                    in the industry,” he noted.                   engineers, architects, and contractors who
Janis Vacca            Tessier added, “From a field office per- are good team players. “They should be
                    spective, our most critical tool has always able to collaborate respectfully and pro-
                    been the paper version of the drawings, and actively with each other,” he explained. “If
                    in the last five years this critical tool has possible, they would have collaborated pre-
                    turned into the iPad. Technology, used the viously together. There should be an open
                    right way, can fast-track a building. The line of communication between these three
                    one thing we need to make sure is that all and also with the client.”
                    parties involved are on the same page as to      Vacca believes it’s also best to bring key
                    how to use the programs, and that includes subcontractors on board earlier with the
                    having access to adequate training.”          design team. Erdy recommends know-
                       The consensus amongst the panel was ing the reputation of the people you will
                    that capacity for change and elasticity of work with. Finally, Marc recommends that
                    the mind is an individual phenomenon. clients should pay their professionals well.
                    As such, change starts with oneself, and “Contractors are not ‘out to get’ clients,” he
                    we should learn these competencies noted. “It’s not just about the money; their
                    as early as possible. They’re applicable pride is in a job well done.” Overall, the
                    both in the professional realm and in lowest-bidder approach was not recom-
                    personal lives. Students should also be mended as the end all, be all option.

24 | JANUARY 2022
business issues

 How do you see your role in construction have a major impact on the industry. He                Daniel Tessier
 projects evolving over the next few years? pointed out that we already use AI tech
     The panelists predicted that technology saying, “At the most basic level, think of
 will continue to improve, changing the all the auto-correct your phone does, or
 design process and allowing all stakeholders jump into a fighter plane and start flying a
 to understand projects more clearly. Erdy jet that’s auto-correcting to what it thinks
 pointed out that we can use current technol- you want. That’s Revit in a nutshell.”
 ogy to help everyone (from the client to the       While the potential impact of AI may be
 construction team) visualize the final prod- huge, both Erdy and Tessier think it’s best
 uct, and find potential conflicts before proj- to resist the urge to dive head-first into new
 ects are physically constructed. However, technologies. Erdy cautioned, “I think that
 technology has also allowed stakeholders while our tools try to help us more, we must
 to dehumanize aspects of construction, and remain masters of our tools.” Tessier added,
 the decades-long trend of society deempha- “Technology has to be used correctly. I think
 sizing the importance of tradespeople has that’s the key point. If we’re not using it
 affected the quality of the trades today.       correctly, whatever the program is, it’s a
     Tessier noted that construction was waste of time or somebody could get hurt,
 one of very few industries that didn’t stop whether hurt physically or financially.”
 throughout the COVID pandemic because              The FLP is an ever-evolving orga-
 it is a critical service. Alongside technologi- nization of like-minded AEC industry            Robert Frodyma
 cal advancements, he would like to see a professionals that are eager to engage in
 change in the secondary school education an impactful dialog and create a road-
 system so that the trades are encouraged map and strategy for disseminating ideas
 as a valued career, which contradicts his and future-oriented practices. Over the
 experience where kids were pushed into coming year, the group will continue its
 the trades when they were not considered thought leadership approach, includ-
“good enough” to do anything else.               ing industry talks, internal dialog, and
                                                 public dissemination of forward-thinking
 What innovations in technology do you ideas. Please join us in shaping the next
 believe will impact your day-to-day generation of talent and moving the
 work the most? What will this change industry towards more open models of
 offer the other project stakeholders?           communication and collaboration. If our
     The panelists highlighted cutting-edge mission resonates with you, reach out via
 technological advances, support for the the LinkedIn page for “Future Leaders
 skilled trades, and a cautious approach to AEC’’ (linkedin.com/groups/12478835)
 adopting new technology. From Erdy’s to stay informed and discover ways to get
 perspective, artificial intelligence (AI) will involved.                                    ■

                                                                                                                  Modern Steel Construction | 25

WORKING CLOSELY WITH A STEEL FABRICATOR is the                        Early Engagement
best way to ensure your steel details are efficient and economical.       The new tower, including mechanical penthouses, is 205 ft tall,
   And the more complex a project, the greater the benefit.           and the structural system comprises steel columns, composite steel
   Tower 3, a 13-story addition to an existing inpatient pavil-       floor framing, and drilled pier foundations, with a concrete lateral
ion at UCHealth University of Colorado Hospital on the                system. A key feature of the building is its open ambulance bay
Anschutz Medical Campus in Aurora, Colo., is one such com-            on the north side, where a large, open space was critical to allow
plex project. Built to meet a growing demand for medical care,        ambulance drivers direct access in and out of the drop-off zone. To
this new addition presented a variety of design challenges and        accommodate this feature, two-story steel trusses were designed
goals. One of them—for the entire project team—was produc-            to keep a 160-ft by 130-ft area of the building free of interior col-
ing a structural design that facilitated an aggressive construc-      umns at the lowest level and also support the 11 steel-framed floors
tion schedule. To accomplish this, the general contractor and         above the ambulance bay.
steel trade partners were included early in the design process.           Haselden Construction, the general contractor, was engaged
Steel systems and details were designed specifically for the          at the start of the project to assist the design team, allowing for
fabricator and erector’s preferences and resulted in an efficient     various structural systems and details to be studied, priced, and
design that could be built on schedule. Steel for the project         scheduled to determine the best approach for constructability and
topped out in October 2021, and the new addition is expected          schedule. Steel fabricator Puma Steel, also brought on board early,
to open this year.                                                    was involved in the steel design and detailing process and helped

26 | JANUARY 2022
For a new Denver hospital,
  early coordination allowed for mill
   order and steel detailing packages
   to be issued prior to construction
           documents. The result?
                  A faster project.

                                                                  Steel for Tower 3 of the UCHealth University of Colorado Hospital on
                                                                  the Anschutz Medical Campus in Aurora, Colo., topped out this past
                                                                  October, and the addition is expected to open this year. Bringing
                                                                  fabricator and detailer Puma Steel on board early in the project
                                                                  helped optimize connection design and keep things on schedule.


with connection type selection. For the most
typical and complicated connections, the two
companies assisted the design team with select-
ing connections that balanced material cost and
labor with schedule.
    To assist with the schedule, the design team
issued several steel mill order and detailing pack-
ages before final structural design was complete.
Mill order package and mill rolling schedules
were coordinated for optimal efficiency, and the
detailing package deadlines were coordinated
with fabrication and erection schedules.

High-Strength Steel
   Grade 65 (A913) steel sections were chosen
for the tower project. When comparing prelimi-
nary designs between 50-ksi members and 65-ksi

                                                                                                           Modern Steel Construction | 27
You can also read