THE NATIONAL RAILWAY MUSEUM OF PIETRARSA NEAR NAPOLI: ON-SITE ASSESSMENT FOR THE STRUCTURAL ANALYSIS
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SACoMaTiS 2008
II University of the studies in Naples
THE NATIONAL RAILWAY MUSEUM OF
PIETRARSA NEAR NAPOLI:
ON-SITE ASSESSMENT FOR THE STRUCTURAL
ANALYSIS
Luigi Guerriero Associate Professor, II University of Naples
P.P. Daco ATOS Progetti, Rome, Italy
Nicola Addesa FERSERVIZI, Rome, Italy
Luigi D’Orta PhD, II University of Naples
SACoMaTiS 2008 HISTORIC NOTES
The national railway museum of Pietrarsa is located into the surviving pavilions of the steel industry
installed from 1842 between the sea and the railway Napoli – Portici. The shop, progressively
extended, was used for the servicing of steam locomotives until 1975 (Rubino 2004)
THE NATIONAL RAILWAY MUSEUM OF PIETRARSA NEAR NAPOLI
2a
1 2b
From 1982 to 1989 the complex was converted into museum function. In 2007, in order to check
the static eligibility of the museum and the attached congress centre, on site assessment were
carried out determining data the structural modelling of masonries
SACoMaTiS 2008 GENERAL PLAN
THE NATIONAL RAILWAY MUSEUM OF PIETRARSA NEAR NAPOLI
Pavilions: “Locomotive a vapore” (1), “Locomotive elettriche” (2),
“Locomotori diesel” (3)
Sites of georadar (square), sound (triangle), with flat jacks (circle),
resistographic (asterisk) tests are marked
SACoMaTiS 2008 GROUND PENETRATING RADAR TESTS
The vertical investigations have verified the presence of anomalies of the masonries and detected the
metal elements inside them. The horizontal tests have verified the foundation of the iron pillars, the
presence of possible connection elements and the nature of the foundation surface
It has been carried out an array of 600 and 2000 Mhz monostatic aerials
THE NATIONAL RAILWAY MUSEUM OF PIETRARSA NEAR NAPOLI
The 2000 Mhz monostatic aerial has given an higher resolution in the first meter depth, the 600 Mhz
crumbled on the surface and increases the definition in depth
3a. pavilion Locomotive a vapore 3b. pavilion locomotive elettriche 3c. pavilion locomotore diesel
The radargram of fig. 3a underlines the high, of about 1 m, of the monolithic stone block in which the metal
pillar is inserted. The pip can’t penetrate in depth, not allowing to detect the lower stratum, but the dielectric
detached between the two materials allows to obtain an visible discontinuity in the radar map. The radargram of
fig. 3b underlines a stone monolithic foundation block of about 1 m, marked from the big hyperbola, underneath
which there is a stratum of compact material up to a depth of 2.20 m. The second scanning confirms the
presence of a substratum quite uniform with a good propagation of the electromagnetic wave. The investigation
has excluded the presence of connecting beams among the foundation plinths
The radargram of fig. 3c reports the results of the vertical scanning, in two directions, on the stone base of a
pillar of the pavilion “Locomotore Diesel”, that underlines the presence of reinforcing bars
SACoMaTiS 2008 SOUND TESTS
In order to assess the homogeneity of the masonries in elevation, we carried out low frequency sound tests, in
correspondence with nodes of a grid drawn up on the masonry face and carrying out the corresponding series of
readings of the crossing speed for transparency
A data acquisition system and a series of sensors with high power transmitter (55 and 20 KHz) and piezoelectric
THE NATIONAL RAILWAY MUSEUM OF PIETRARSA NEAR NAPOLI
high sensibility receiver, which measure the propagation time of the compressional waves (P waves) also in
materials with little characteristics of propagation and speed, have been used for the investigation
The transmitter and the receiver are active and both are inside the transducer
Speed measurement and display of the shock wave through palmar PC have allowed to test for every movement
the pip’s effectiveness and to register the speed value concerning every transmitted impulse
We have defined 75 cm wide square meshes (25 cm large) on the walls (85 to 170 cm thick) of the three tested
pavilions, near the building blocks tested with flat jacks
For the data processing we have taken into consideration only the maximum speed values tested for every path,
assuming them as related to the shortest ways followed by the wave
The results underlined the ranging of values with those reported from the literature for a yellow tuff masonry
blocks (1600 m/sec) and the substantial transversal homogeneity of the tested walls, also with a inside sack, well
constipated
4a. Sound test on masonry of 85 cm thick 4b. Sound test on masonry of 115 cm thick
SACoMaTiS 2008 THERMOGRAPHIC ASSESSMENT
The thermovisual investigation has been carried out with “passive method”, taking the superficial
temperature reached from the walls as a consequence of the solar radiation
THE NATIONAL RAILWAY MUSEUM OF PIETRARSA NEAR NAPOLI
The investigation has been directed to the individualization of the metrological characters of the masonries
and to the assessment of the metal structure of the covers
The investigation has been directed to the individualization of the metrological characters of the masonries
and to the assessment of the metal structure of the covers
The good thermal inertia reached from the walls have allowed to read the superficial thermal projection of
the mortar joints of the masonry. The range between the lowest and the highest temperature found from the
termo camera is 14°C
The thermogram in fig. 5a has been recorded in a stage of solar overheating, with raising of the medium
superficial temperature up to 35°C, with peak of 37°C
The surface, despite heated uniformly in the accumulation stage, has heterogeneous superficial
temperatures, with cold zones in correspondence of the roof and relatively hot zones on the left side
Here it is reading the building texture, constituted of rows of little yellow tuff blocks alternate to bricks
5a
SACoMaTiS 2008 THERMOGRAPHIC ASSESSMENT
THE NATIONAL RAILWAY MUSEUM OF PIETRARSA NEAR NAPOLI
The thermogram in fig. 5b underlines, over a circular window, the ashlars of a wide
arcade filled
The sector affected from superficial deterioration is underlined from higher thermal
inertia
5b
SACoMaTiS 2008 FLAT JACKS TESTS
THE NATIONAL RAILWAY MUSEUM OF PIETRARSA NEAR NAPOLI
6a 6b
We have used semicircular flat jacks with surface of 761.5 cm2, 3.5 mm thick, diameter 34.7 cm, installation
depth of 25.7 cm, constants Km = 0.80, Kt = 0.78
The single flat jack tests have provided exercise strains of the masonry included between 0. 258 and 0.389 Mpa
In fig. 6a we report the pressure – transfer diagram concerning a single flat jack test and in fig. 6b the pressure
– deformation diagram concerning a double flat jacks test, which has recorded a breaking pressure of 17 bar,
from which it’s drawn E= 2300 Mpa
This is a representative test of all tests carried out into the monumental complex; the standard deviation in
comparison with the mean curve is slight. The rapresentative value of tests is warranted from the homogeneity
of the masonry textures, all of a kind named “filari di blocchetti”
SACoMaTiS 2008 CONCLUSIONS
THE NATIONAL RAILWAY MUSEUM OF PIETRARSA NEAR NAPOLI
CONCLUSIONS
The correlation of the data provided by the on-site investigation underlines
the homogeneity and the satisfying quality of the masonries, subjected, at
the bottom, to a exercise pressure of about 0,4 N/mm2, against a fm breaking
resistance of 1,70 N/mm2. The modulus of elasticity of the masonry is 2300
N/mm2, higher than the maximum value indicated by DPCM 3274/2003. These
parameters have been taken on in the structural modeling without applying
reduction coefficients because the number and the type of tests allow to
reach a maximum knowledge level, in accordance with the national laws
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