AP1000核岛厂房考虑重力水箱流体-结构相互作用的地震易损性分析研究

AP1000核岛屏蔽厂房非能动冷却系统对提升核电安全具有重要作用，但重力水箱在强震下的流体-结构相互作用对屏蔽厂房的地震动响应有很大影响。基于ALE流固耦合分析方法，本文研究了重力水箱内不同流体高度对屏蔽厂房在强震下的地震动易损性的影响，并对重力水箱内四种隔板设计方案下的厂房地震动易损性进行了比较。结果表明，AP1000核电厂房在水箱内无水的情况下易损性最高，其次是保证72小时供水的标准水位，在水位高度为标准水位的2/3左右时厂房易损性最小；水箱内隔板设置形式对厂房易损性有很大影响。
Abstract：:Non-active cooling system plays an important role in improving the security of an AP1000 nuclear power plant.But the fluid-structure interaction in gravity water box has great effects on the earthquake response of a NI shield building.In this paper,the seismic fragility analysis of a NI shield building with different water levels in a gravity water box were performed based on the ALE fluid-structure coupling algorithm and the effects of different water height on seismic fragility curves were compared.The seismic fragility curves were also obtained for proposed four kinds of baffle design schemes and the effects on seismic fragility curves were analyzed.The results show that,when there is no water in the gravity water box,the fragility of the NI shield is the highest; and the next is in the condition of normal water level which could guarantee water supply for 72 hours.NI shield buildings possess the lowest fragility when water level is 2/3 of normal water level; and the setting form of the baffles also has great effects on the fragility of the shield building.