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NDT.net Issue - 2015-11 - Articles
NDT.net Issue: 2015-11
Publication: International Symposium Non-Destructive Testing in Civil Engineering (NDTCE 2015), 15-17 Sep 2015, Berlin, Germany (NDTCE 2015)
Session: Bridges
ARTICLE

From Palladio to Reinforced Concrete: NDT Applied to the Old and the New Bridge of Bassano del Grappa

Dario Foppoli3
Foppoli Moretta e Associati s.r.l.3, Tirano, SO, Italy

Abstract: An NDT campaign was performed in 2014 to assess the structural conditions of the two bridges over the river Brenta in Bassano del Grappa, Italy. A major problem in the execution of these inspection activities was related to the access to the structures: the investigation was therefore carried out with the use of ropes as positioning and access devices: engineers and technicians were able to make the inspection and to reach the test points without restrictions for traffic and moreover with effective cost savings for the client. The old timber bridge, designed by Andrea Palladio in 1569, was carefully analysed by laser-scanning survey that provided detailed information about its current deformation pattern. The visual inspection of all the structural members was accomplished through the assessment of the state of deterioration of the wooden trusses; direct tests on wooden elements were performed by mechanical drilling instrument, and micro-sampling and macroscopic analysis allowed the identification of the species of wood. To complete the analysis drillings, corings, video surveys and flat jack tests were performed on the masonry of the abutments. The new bridge, a reinforced concrete structure built in 1917, was analysed to detect its current state of deterioration related with the effects of the carbonation. A detailed visual inspection was carried out; NDTs were then performed by covermeter for the assessment of the thickness of the cover and of the dimensions of ...

Keywords: Other Methods (1114), cultural heritage (73), Wooden Structures (2), access by ropes (1),
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