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Time-variant fragility analysis of the bridge system considering time-varying dependence among typical component seismic demands

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Abstract

This paper presents a copula technique to develop time-variant seismic fragility curves for corroded bridges at the system level and considers the realistic time-varying dependence among component seismic demands. Based on material deterioration mechanisms and incremental dynamic analysis, the time-evolving seismic demands of components were obtained in the form of marginal probability distributions. The time-varying dependences among bridge components were then captured with the best fitting copula function, which was selected from the commonly used copula classes by the empirical distribution based analysis method. The system time-variant fragility curves at different damage states were developed and the effects of time-varying dependences among components on the bridge system fragility were investigated. The results indicate the time-varying dependence among components significantly affects the time-variant fragility of the bridge system. The copula technique captures the nonlinear dependence among component seismic demands accurately and easily by separating the marginal distributions and the dependence among them.

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Acknowledgement

This study was supported by Natural Science Foundation of China (Grant No. 51808376) The authors are grateful for this support.

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Authors and Affiliations

  1. Department of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Shuai Song

  2. Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Yongjiu Qian

  3. Department of Environmental Science, Baylor University, Texas, 76798, USA

    Jing Liu

  4. Southwest Municipal Engineering Design and Research Institute of China, Chengdu, 610031, China

    Xiaorui Xie

  5. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, 330013, China

    Gang Wu

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  1. Shuai Song
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  2. Yongjiu Qian
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Correspondence to Shuai Song.

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Song, S., Qian, Y., Liu, J. et al. Time-variant fragility analysis of the bridge system considering time-varying dependence among typical component seismic demands. Earthq. Eng. Eng. Vib. 18, 363–377 (2019). https://doi.org/10.1007/s11803-019-0509-6

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  • DOI: https://doi.org/10.1007/s11803-019-0509-6

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