基于增量动力分析的重力坝抗震性能评估  

Evaluation of seismic performance of gravity dam based on incremental dynamic analysis

作　　者：郑晓东 郝建国 李丹丹[2] ZHENG Xiaodong;HAO Jianguo;LI Dandan(College of vuater conservancy and hydropoiver Hebei University of Engineering,Handan 056000,China;Tianjin University,Tianjin 300350,China)

机构地区：[1]河北工程大学水利水电学院,河北邯郸056000 [2]天津大学,天津300350

出　　处：《南水北调与水利科技（中英文）》2020年第2期184-190,共7页South-to-North Water Transfers and Water Science & Technology

基　　金：河北省自然科学基金(E2018402131);河北省教育厅人才拔尖项目(BJ2018049)。

摘　　要：基于增量动力分析法(IDA),采用塑性耗能与总变形能的比值作为结构性能指标,提出了重力坝抗震性能评价的三级震害划分和两个极限状态下的失效性划分的建议,做出IDA曲线,并结合分位数分析和易损性分析对重力坝抗震性能进行评估。以邯郸京娘湖重力坝为例,进行一系列的非线性分析,结果表明:分位数分析的IDA曲线中每个极限状态的峰值地面加速度PGA均大于设计地震的峰值地面加速度,满足该重力坝的功能保障性水平和安全保证性水平。易损性分析下,1.5倍设计地震作用时65.92%的概率处于正常使用阶段,100%可以保证安全。结果表明该重力坝具有良好的抗震性能。该项研究结果为重力坝抗震性能设计和安全风险评估提供了新思路。The ratio of plastic energy consumption to total deformation energy based on the incremental dynamic analysis method(IDA)was used as the structural performance index.The three-level seismic damage classification of gravity dam seismic performance evaluation and the failure degree division under two limit states were proposed.The IDA curve was made and combined with the quantile analysis and fragility analysis to evaluate the seismic performance of the gravity dam.Taking the Jingniang Lake gravity dam as an example,a series of nonlinear analyses were carried out.The results showed that the peak ground acceleration(PGA)of each limit state in the IDA curve of the quantile analysis was larger than the peak ground acceleration of the designed earthquake,which satisfied the gravity and the level of functional support and safety assurance of the dam.Under the fragility analysis,65.92% probability of the 1.5 times design earthquake was in the normal use stage and could a 100% safety guarantee.The results showed that the gravity dam had a good seismic performance.The results of this study may provide a new idea for the seismic performance design and safety risk assessment of gravity dams.

关 键 词：增量动力分析 分位数分析 易损性分析 塑性耗能 抗震性能 

分 类 号：TV642.3[水利工程—水利水电工程]