Earthquakes and Structures

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Time-dependent seismic risk analysis of high-speed railway bridges considering material durability effects

  • Yan Liang (School of Water Conservancy and Civil Engineering, Zhengzhou University) ;
  • Ying-Ying Wei (School of Water Conservancy and Civil Engineering, Zhengzhou University) ;
  • Ming-Na Tong (School of Water Conservancy and Civil Engineering, Zhengzhou University) ;
  • Yu-Kun Cui (School of Water Conservancy and Civil Engineering, Zhengzhou University)
  • Received : 2022.12.10
  • Accepted : 2023.03.15
  • Published : 2023.04.25
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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.

Keywords

Acknowledgement

This research was supported by the National Science Foundation of China (Grant No.51608488), Scientific and Technological Project of Henan Province, China (Grant No.202102310268) and Young Teacher Foundation of Zhengzhou University(Grant No. 2121ZDGGJS008).

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