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, 11 5 倍设计地震作用时 651 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 energ y consumptio n to t otal deformat ion ener gy based on the incremental dynamic analysis method ( IDA) w as used as t he str uctural performance index . T he three2lev el seismic damage classificatio n of gr avit y dam seismic per2 fo rmance ev aluatio n and t he failure deg ree div ision under tw o limit states wer e pro posed. The IDA cur ve w as made and com2 bined w ith the quantile analysis and fr agilit y analy sis t o evaluate the seismic performance of the gr avity dam. Taking the Jing2 niang Lake g ravity dam as an ex ample, a series o f nonlinea r analyses wer e carried out. The results showed that the peak g ro und acceler atio n ( PGA) of each limit state in the IDA curve o f the quantile analy sis was lar ger t han the peak g ro und acceler atio n of the designed earthquake, which satisfied the gr avit y and the lev el of functional suppo rt and safety assur ance of the dam. Under the fr agility analy sis, 651 92% probability of the 11 5 times desig n earthquake was in the no rmal use stag e and could a 100% safety guar antee. The results show ed that the g ravity dam had a g oo d seismic perfo rmance. The r esults of this study may pro2 v ide a new idea fo r the seismic performance design and safety risk assessment o f gr avit y dams.

河北省自然科学基金( E2018402131) ; 河北省教育厅人才拔尖项目( BJ 2018049)