Elastoplastic structural analysis of the Paderno d’Adda bridge (Italy, 1889) based on Limit Analysis
Wariant tytułu
Sprężysto-plastyczna analiza konstrukcji mostu Paderno d’Adda (Włochy, 1889) oparta na analizie granicznej
Autor
Rosalba, Ferrari
Cocchetti, Giuseppe
Egidio, Rizzi
Data wydania
2013
Miejsce wydania
Warszawa
Wydawca
Stowarzyszenie Konserwatorów Zabytków
Język
angielski
Słowa kluczowe
historical iron arch bridge, non-linear FEM model, Elastoplastic structural analysis, limit analysis, collapse load multiplier, collapse mode
zabytkowy stalowy most łukowy, nieliniowy model w MES, sprężysto-plastyczna analiza konstrukcji, analiza graniczna, mnożnik obciążenia, forma utraty stateczności
Abstrakt
The Paderno d’Adda bridge is a marvellous historical iron arch bridge that was built in 1889. It allows connecting the provinces of Lecco and Bergamo across the Adda river, between Paderno d’Adda and Calusco d’Adda, near Milano, northern Italy. The bridge was designed for railway needs and its use is two-fold: a railway track is located in the inner deck of the upper continuous beam; automotive traffic runs on top of it. Today, after 123 years of continuous duty, the viaduct is still in service, with trains crossing at slow speed and alternated one-way road traffic restricted to no heavyweight vehicles. Despite these duties, the bridge seems to have suffered from limited maintenance. With the final purpose of elaborating a safety assessment of the structure, an inelastic structural analysis of the viaduct is performed, based on a finite element model that takes into account a perfect elastoplastic behaviour of the various structural members and is apt to comply with typical principles of Limit Analysis. Specifically, the critical load multiplier and relevant collapse mode are investigated, for different static loading conditions on the bridge. Also, the characteristic nonlinear load/displacement response curves of the bridge are traced by incremental analyses up to the true limit load and the various critical members of the structure are identified. A further intention of this work consists in promoting interest at the international level on the Paderno d’Adda bridge, as a beautiful, living industrial monument of the scientific and technological developments of that time, by referring particularly to its present and future destinations.
