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http://dx.doi.org/10.12989/eas.2020.19.4.287

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)
Publication Information
Earthquakes and Structures / v.19, no.4, 2020 , pp. 287-301 More about this Journal
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
eismic performance; fragility; damage index; durability damage;
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Times Cited By KSCI : 4  (Citation Analysis)
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