基于多个响应量的拱坝地震易损性分析

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Abstract A structural fragility model provides an effective tool for safety evaluation by utilizing a probabilistic framework to consider uncertainty factors affecting structural performance. Here, Baihetan arch dam was taken as the study object, selecting a group of strong earthquake records, considering uncertainties of earthquakes and materials, the incremental method was used to do seismic fragility analysis for Baihetan arch dam.The damage and failure process of the arch dam under ground motion with continuous amplitude-modulation was counted to intuitively divide seismic damage grades of the arch dam, and determine boundary values among various damage grades of 3 responses including arch crown displacement, transverse seam opening and damage volume ratio. Through fitting the results of IDA, probabilistic seismic demand models of 3 responses were established, respectively, and then seismic fragility curves were solved. Fragility curves based on 3 responses under different damage grades were comprehensively compared to fully reflect the fragility of the arch dam. It was shown that seismic fragility curves can be used to predict probabilities of the arch dam reaching various damage grades under action of earthquakes with different intensities; the study results provide a theoretical basis for seismic safety evaluation of arch dams based on performance.

Key words： arch dam seismic fragility analysis incremental dynamic analysis (IDA) uncertainty seismic damage grade

Received: 28 May 2018 Published: 28 December 2019

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	Articles by authors
	TIAN Shuo
	FAN Shuli
	CHEN Jianyun

Cite this article:

TIAN Shuo,FAN Shuli,CHEN Jianyun. Seismic fragility analysis for arch dam based on multiple responses[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(1): 253-259.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I1/253

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