隔震与非隔震核岛辅助厂房易损性分析

Vulnerability analysis of isolated and non-isolated nuclear island auxiliary factory building

针对基础隔震对核岛厂房抗震性能的作用评估问题,首次对核岛辅助厂房抗震性能指标的划分进行了探讨,建立了坚硬土场地下隔震和非隔震核岛厂房的数值模型;分别基于IDA和MSA方法得到的易损性曲线,根据该指标进行了隔震和非隔震结构的抗震易损性对比研究,论证了隔震措施可提高结构的抗倒塌安全储备。分析结果表明,两种方法得到的结果基本上一致,这证明了结果的合理性。隔震支座能明显降低核岛厂房的失效概率,降低幅度最大可达到23%,隔震厂房在大震下发生倒塌的概率要比非隔震厂房降低80%,安全储备系数提高了11%,并且混凝土失效概率对两种厂房整体失效概率起控制作用。

In view of evaluation about the effect of base isolation on the seismic performance of the nuclear power plant building,this paper,for the first time,explores division of seismic performance indexes of nuclear power plant auxiliary building,establishes numerical model of isolated and non-isolated nuclear power plant building on hard soil ground,obtains vulnerability curves based on IDA and MAS methods respectively,carries out seismic vulnerability comparative study of isolated and non-isolated structures based on the indexes and demonstrates the higher anti-collapse safety reserve of the isolation measure. The results show that： the results obtained by the two methods are basically consistent,which proves the rationality of the results. Isolation bearing can significantly reduce the failure probability of nuclear power plant building and maximum of decrease amplitude can reach 23%,and collapse probability of isolated factory building under major earthquake can reduce 80% than that of non-isolated factory building. The safety reserve coefficient is increased by 11% and failure probability of concrete plays a controlling role in the overall failure probability of the two kinds of factory building.