强地震作用下混凝土重力坝抗震安全评价

摘要

The stability and safety of gravity dam under strong earthquake is analyzed by using new ground motion parameters.The response spectrum method and time history analysis method are used to calculate the seismic dynamic response of structures respectively.The natural vibration characteristics are analyzed,the weak parts of structure are determined,and then effective seismic strengthening measures are put forward.The evaluation results show that there are small ranges of damage near dam heel and toe and the break slope,and the yield region passing through upstream and downstream is not formed.The safety performance of concrete gravity dam meets the requirements of new seismic parameters.The structure design of dam is reasonable and the dam can withstand high-intensity earthquake.%采用新的地震动参数对重力坝进行抗震复核,分析强地震作用下坝体的抗震稳定安全性.采用反应谱法和时程分析法分别计算结构的地震动力响应,分析其自振特性,确定结构的薄弱部位,并提出有效可行的抗震加固措施.评价结果表明:在坝踵和坝趾附近区域及上下游折坡处出现了小范围的损伤,并未形成贯穿上下游的屈服区域,混凝土重力坝的安全性能满足新的地震参数要求,结构设计合理,能够抵御高强度地震.