PSI - Issue 70

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ScienceDirect

Procedia Structural Integrity 70 (2025) 19–26

Structural Integrity and Interactions of Materials in Civil Engineering Structures (SIIMCES-2025) Seismic response evaluation of RC bridge considering maximum and residual column curvature ductility Edavalath Nadeem a , Karuparambath Muhammed Navvar b , Muhamed Safeer Pandikkadavath c, *, Sujith Mangalathu d a PG Scholar in Structural Engineeirng, Department of Civil Engineering, National Institute of Technology Calicut, Kozhikode, 673601, India b PhD Scholar in Structural Engineeirng, Department of Civil Engineering, National Institute of Technology Calicut, Kozhikode, 673601, India c Assistant Professor, Department of Civil Engineering, National Institute of Technology Calicut, Kozhikode, 673601, India d VAJRA Faculty, Department of Civil Engineering, National Institute of Technology Calicut, Kozhikode, 673601, India As a critical component of civil infrastructure, the seismic performance of reinforced concrete (RC) bridges is of significant interest to both engineers and society. Traditional vulnerability assessments typically rely on peak structural response parameters; however, recent studies emphasize that residual responses also play a key role in post-earthquake damage and repairability. This study evaluates the seismic behaviour of a representative RC bridge by developing a combined fragility model that incorporates both maximum and residual column curvature ductility. A detailed nonlinear model is constructed in the OpenSees platform, incorporating appropriate material and geometric nonlinearities. Nonlinear time history analyses are carried out using a suite of ground motions recommended by prior studies. From the analyses, both maximum and residual curvature ductility values are obtained. A statistical correlation between them is established using linear regression in logarithmic space. Separate fragility curves for each ductility type are developed and subsequently integrated using the first-order reliability method to produce a combined fragility representation. The results underscore the importance of including residual demand parameters in seismic performance evaluations. Abstract

© 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 International Conference on Structural Integrity Organizers

Keywords: RC bridge; Nonlinear time history analysis; Maximum and residual column curvature ductility; Individual and combined fragility;

* Corresponding author. Tel.: +91-9895599785. E-mail address: msafeerpk@nitc.ac.in

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 International Conference on Structural Integrity Organizers 10.1016/j.prostr.2025.07.021