Ultimate seismic capacity loss of high arch dam based on mainshock-aftershock sequences

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (3) : 82-89.

JIN Aiyun, WANG Jinting, PAN Jianwen

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Abstract

In the current practice of dam engineering, only the mainshock is considered in the seismic design of high arch dams, and the multiple aftershocks which may occur in an earthquake event are ignored. In this paper, the mainshock-ETA aftershock sequences which based on endurance time analysis (ETA) method are constructed and the loss of ultimate seismic capacity (USC) is defined. As a case study, the seismic behavior of the Dagangshan arch dam using the nonlinear analysis model of dam-reservoir-foundation systems, which considers the opening of contraction joints, the nonlinearity of dam concrete, and the radiation damping effect of semi-unbounded foundation. The analysis results show that the structure response resulted from ETA is comparable with that of incremental dynamic analysis (IDA). Mainshocks may results in the loss of the USC of high arch dams, which will increase with increasing in the mainshock intensity. Finally, the USC curve of the Dagangshan arch dam is generated. According the USC curve, the Dagangshan arch dam has a certain safety margin under design earthquakes.

Key words

High arch dam / nonlinear dynamic analysis / seismic capacity / mainshock-aftershock / damage

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JIN Aiyun, WANG Jinting, PAN Jianwen. Ultimate seismic capacity loss of high arch dam based on mainshock-aftershock sequences[J]. Journal of Vibration and Shock, 2022, 41(3): 82-89

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