PSI - Issue 62

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2022) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 62 (2024) 763–772

II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Condition and structural assessment of a historic steel bridge according to the Italian guidelines for the evaluation of safety of existing structures Ettore De La Grennelais b , Antonio Nicolò b , Cheng Lan a , Alessandra Romano a , Riccardo Terrassan a , Tobia Zordan a, * a BOLINA Ingegneria S.r.l. - Via del Gazzato 20, 30173 Venezia – Mestre (VE), Italy b ANAS S.p.A. Struttura Territoriale Veneto e Friuli Venezia Giulia - Via Millosevich 49, 30173 Venezia – Mestre (VE), Italy Abstract “Ponte dei Bersaglieri ” is a historic bridge built in the early 1900s and rebuilt after the Second World War in San Donà di Piave, Venice, Italy. The bridge consists of four 53 m spans for a total length of 200 m. The spans are made of a steel lattice structure resting on concrete piles and abutments. At the request of the Managing Authority, a "Level 4" check and a serviceability check were planned in accordance with the Guidelines for Existing Bridges. The verification of such a bridge presents several difficulties related to the lack of basic information, as the documentation of the original project and the many interventions carried out over time were not available. Based on the scattered information collected, several surveys were organized to obtain certain information about the structure. Firstly, the geometry was measured globally by means of a point cloud produced by a drone survey, together with manual measurement of the thickness of individual members. A preliminary FEM model was then created, based on mechanical tests and inspections of existing materials. The aim of this phase was to determine the mechanical characteristics of both superstructures and substructures using destructive and non-destructive testing. An accelerometer data acquisition campaign was then planned to obtain the natural frequencies and mode shapes of the structure using the OMA method and to verify the compliance of the FEM model. At the end of the investigation campaigns, the FEM model can be finalized and it is possible to carry out level 4 verifications and serviceability checks. The inspection of the foundations in the riverbed will be conducted in the specific case with “multibeam technology to evalua te the erosion of the bottom of the riverbed and consequently the possible erosion of piers and abutments.

* Corresponding author. Tel.: +39-041-614185; fax: +39-041-2621945. E-mail address: zordan@bolinaingegneria.com

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4. 0 ) Peer-review under responsibility of Scientific Board Member s

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Scientific Board Members 10.1016/j.prostr.2024.09.104