Title: Seismic fragility analysis of H shape pylon cable-stayed bridge considering soil-pile interaction

Authors: Jigar P. Variyavwala; Kaushik M. Gondaliya; Atul K. Desai

Addresses: Department of Civil Engineering, P.P. Savani University, Kosamba, India ' Department of Civil Engineering, S.V. National Institute of Technology, Surat, India ' Department of Civil Engineering, S.V. National Institute of Technology, Surat, India

Abstract: The current study is focused on seismic fragility analysis (SFA) to predict the seismic vulnerability of cable-stayed bridges (CSB) under uncertain seismic excitations considering soil-structure interaction (SSI). Seismic fragility curves (FC) exemplify the probable damage of CSB as a function of strong ground motions and can be used to evaluate the extent of damage probability for a certain ground motion index. This research utilised 25 ground motions to evaluate H-shaped pylon CSB in Indian Seismic Zone-V. The FCs have been developed using incremental dynamic analysis (IDA) for four performance criteria. The pylon DR and bearing displacement have been used to produce component FC. The traditional IDA approach is adopted, which involves linear regression. The bound limits have been derived using the first-order reliability theory. Analysis results prove that bearings are the most fragile component; their placements and hinge formulations significantly affect the system fragility.

Keywords: seismic fragility assessment; uncertainty; cable-stayed bridge; CSB; intensity measure; incremental dynamic analysis; IDA; seismic fragility analysis; SFA; soil-structure interaction; SSI.

DOI: 10.1504/IJSTRUCTE.2023.134238

International Journal of Structural Engineering, 2023 Vol.13 No.3, pp.321 - 346

Received: 30 Jun 2022
Accepted: 16 Apr 2023
Published online: 13 Oct 2023 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article