PSI - Issue 75

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia (2025) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 75 (2025) 254–261

© 2025 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 the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper Abstract Long Bien Bridge (LBB) built between 1899 and 1902, is an iconic bridge of Hanoi, Vietnam. The bridge across the Red River with a length of 2 290 meters. Due to History, only some parts of the original structure remain intact, while large sections have been built later to repair the holes and destroyed parts. To ensure the safety and durability of the bridge, it is necessary to have a complete diagnostic of the structure under various loadings, with a distribution of the stresses in the load-carrying components. This is why Cetim and HUCE modelled numerically the first six spans of LBB, on Hanoi city side, for simulating the mechanical behavior, supporting the existing plans for maintenance and being a guideline of the project for complete renovation of LBB. A campaign of geometric measurement was necessary to recalibrate the theoretical modelling based on drawings and the various degradations (loss of thickness due to corrosion, holes…) and modifications (repairs, replacement of structural components…) were also considered. The final evaluation of RLA required the iterative analysis of the archives data collected concerning the different traffic histories of the bridge (trains, trucks, ...) to the relevant load cases and load combinations. © 2025 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 the scientific committee of the Fatigue Design 2025 organizers Keywords: Long Bien Bridge; RLA; Fatigue ; Traffic 1. Introduction The ageing process of railway bridges is a worldwide issue. In Europe, most of the steel railway bridges are over 50 years old. Many of them have already exceeded their 100 years design work life (Bell, 2004). In India, 25 % of the 1,47,523 railway bridges are over 100 years old (Baby et al., 2021). In North America, more than 50 percent of the railway bridges are more than 100 years old, some of them being close to 150 years old (Rakoczy et al., 2020). Railway bridges are basically subjected to cyclic and movable loads, resulting in fatigue damage due to the amount of variable stress ranges. Fatigue Design 2025 (FatDes 2025) Residual Life Assessment (RLA) of Long Bien Bridge (Hanoi) Bruno Depale a , Dinh Duc Pham b , Ba Danh Le b a CETIM, Senlis, France b Hanoi University of Civil Engineering, Hanoi, Vietnam

2452-3216 © 2025 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 the scientific committee of the Fatigue Design 2025 organizers

2452-3216 © 2025 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 the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper 10.1016/j.prostr.2025.11.027