基于主余震序列的高拱坝极限抗震能力损失研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (3) : 82-89.

论文

金爱云，王进廷，潘坚文

作者信息 +

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

JIN Aiyun, WANG Jinting, PAN Jianwen

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文章历史 +

摘要

目前，高拱坝的抗震安全性分析中仅考虑单独主震的作用，而忽略地震中可能伴随发生的多次余震，对高拱坝在主余震序列作用下的动力响应规律尚缺乏充分认识。本文以大岗山拱坝为例，建立了综合考虑坝体损伤非线性、横缝开合以及半无限地基辐射阻尼效应的拱坝-库水-地基有限元分析模型，并基于耐震时程法（ETA）构建主震-ETA余震序列进行高拱坝非线性动力分析。研究结果表明，ETA的计算结果与增量动力分析法（IDA）具有可比性；高拱坝的极限抗震能力在主震受损情况下将发生损失，且随主震强度增大而损失增加。最后，基于主震-ETA余震序列计算结果给出了大岗山拱坝的极限抗震能力损失曲线。

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.

导出引用

金爱云，王进廷，潘坚文. 基于主余震序列的高拱坝极限抗震能力损失研究[J]. 振动与冲击, 2022, 41(3): 82-89

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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