Earthquakes and Structures

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Influence of time-varying attenuation effect of damage index on seismic fragility of bridge

  • Yan, Jialei (School of Civil Engineering, Harbin Institute of Technology) ;
  • Liang, Yan (School of Civil Engineering, Zhengzhou University) ;
  • Zhao, Boyang (School of Civil Engineering, Zhengzhou University) ;
  • Qian, Weixin (School of Architecture, Harbin Institute of Technology) ;
  • Chen, Huai (School of Civil Engineering, Zhengzhou University)
  • Received : 2020.08.07
  • Accepted : 2020.10.19
  • Published : 2020.10.25
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Abstract

Fragility as one of the most effective methods to evaluate seismic performance, which is greatly affected by damage index. Taking a multi span continuous rigid frame offshore bridge as an example. Based on fragility and reliability theory, considering coupling effect of time-varying durability damage of materials and time-varying attenuation effect of damage index to analyze seismic performance of offshore bridges. Results show that IDA curve considering time-varying damage index is obviously below that without considering; area enclosed by IDA of 1# pier and X-axis under No.1 earthquake considering this effect is 96% of that without considering. Area enclosed by damage index of 1# pier and X-axis under serious damage with considering time-varying damage index is 90% of that without considering in service period. Time-varying damage index has a greater impact on short pier when ground motion intensity is small, while it has a great impact on high pier when the intensity is large. The area enclosed by fragility of bridge system and X-axis under complete destruction considering time-varying damage index is 165% of that without considering when reach designed service life. Therefore, time-varying attenuation effect of damage index has a great impact on seismic performance of bridge in service period.

Keywords

References

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