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Earthquakes and Structures Volume 19, Number 4, October 2020 , pages 287-301 DOI: https://doi.org/10.12989/eas.2020.19.4.287 |
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Influence of time-varying attenuation effect of damage index on seismic fragility of bridge |
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Jialei Yan, Yan Liang, Boyang Zhao, Weixin Qian and Huai Chen
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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. | ||
| Key Words | ||
| seismic performance; fragility; damage index; durability damage | ||
| Address | ||
| Jialei Yan:School of Civil Engineering, Harbin Institute of Technology, 92 xidazhi street, Nangang District, Harbin, China Yan Liang, Boyang Zhao,Huai Chen:School of Civil Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou, China Weixin Qian:School of Architecture, Harbin Institute of Technology, 92 xidazhi street, Nangang District, Harbin, China | ||