Techno Press
You logged in as. Techno Press

Earthquakes and Structures
  Volume 24, Number 4, April 2023 , pages 275-288
DOI: https://doi.org/10.12989/eas.2023.24.4.275
 


Time-dependent seismic risk analysis of high-speed railway bridges considering material durability effects
Yan Liang, Ying-Ying Wei, Ming-Na Tong and Yu-Kun Cui

 
Abstract
    Based on the crucial role of high-speed railway bridges (HSRBs) in the safety of high-speed railway operations, it is an important approach to mitigate earthquake hazards by proceeding with seismic risk assessments in their whole life. Bridge seismic risk assessment, which usually evaluates the seismic performance of bridges from a probabilistic perspective, provides technical support for bridge risk management. The seismic performance of bridges is greatly affected by the degradation of material properties, therefore, material damage plays a nonnegligible role in the seismic risk assessment of the bridge. The effect of material damage is not considered in most current studies on seismic risk analysis of bridges, nevertheless. To fill the gap in this area, in this paper, a nonlinear dynamic time-history analysis has been carried out by establishing OpenSees finite element model, and a seismic vulnerability analysis is carried out based on the incremental dynamic analysis (IDA) method. On this basis, combined with the site risk analysis, the time-dependent seismic risk analysis of an offshore three-span HSRB in the whole life cycle has been conducted. The results showed that the seismic risk probabilities of both components and system of the bridge increase with the service time, and their seismic risk probabilities increase significantly in the last service period due to the degradation of the material strength, which demonstrates that the impact of durability damage should be considered when evaluating the seismic performance of bridges in the design and service period.
 
Key Words
    bridge seismic resistance; high-speed railway bridges; material durability; seismic risk assessment; seismic vulnerability; whole life cycle
 
Address
School of Water Conservancy and Civil Engineering, Zhengzhou University, 450001, China
 

Techno-Press: Publishers of international journals and conference proceedings.       Copyright © 2025 Techno Press
P.O. Box 33, Yuseong, Daejeon 305-600 Korea, Tel: +82-42-828-7996, Fax : +82-42-828-7997, Email: admin@techno-press.com