【摘要】为了研究在地震作用下混凝土重力坝的整体抗震性能,以我国西南地区200 m级的光照混凝土重力坝为例,建立了整体大坝的坝体-库水-地基系统三维有限元模型,基于增量动力分析法对该模型进行了地震响应分析及地震易损性分析。根据整体大坝模型的增量动力分析计算结果,分别提取了坝顶和底孔的位移进行IDA曲线、分位曲线以及地震易损性曲线的绘制。结果表明地震波的PGA在0. 2 g以下时,坝体出现破坏的概率很低; PGA为0. 3 g以下时,可满足坝体基本功能保障;PGA在0. 6 g以下时,能满足坝体基本安全保证。
【基金资助】 国家自然科学基金项目(51309143); 湖北省自然科学基金项目(2018CFB652); 流域水循环模拟与调控国家重点实验室开放研究基金(IWHR-SKL-201716);
Study on anti-seismic performance of three-dimensional concrete gravity dam system based on IDA
【Abstract】For the aim of studying the anti-seismic performance of concrete gravity dam under earthquake loads, the Guangzhao concrete gravity dam with 200 meters height in the Southwest China was taken as an example. The three-dimensional finite element model of the dam body–reservoir water–foundation system was established. Dynamic analysis and seismic vulnerability analysis were carried out based on the incremental dynamic analysis (IDA) method. According to the IDA results of the whole dam model, the displacements of the dam crest and the bottom hole were extracted. The IDA curves, the fractile curves, and the seismic vulnerability curves were obtained. It is concluded that when the PGA of the seismic wave was below 0.2 g, the probability of damage to the dam was very low; when the PGA was 0.3 g or less, the basic function guarantee of the dam can be satisfied; when the PGA was below 0.6 g, the basic safety requirement of the dam can be met.
【Keywords】 concrete gravity dam; three-dimensional model; Incremental Dynamic Analysis (IDA); seismic vulnerability;
【Funds】 National Natural Science Foundation of China (51309143); Natural Science Foundation of Hubei Province (2018CFB652); Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (IWHR-SKL-201716);
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