考虑竖向地震动影响的某核电安全壳地震易损性研究  

Seismic Fragility Analysis of a Nuclear Power Plant Containment Considering Vertical Ground Motion Effect

作　　者：王晓磊 吕大刚[3] 阎卫东 WANG Xiaolei;LYU Dagang;YAN Weidong(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Hebei Key Laboratory of Earthquake Disaster Prevention and Risk Assessment,Sanhe 065201,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]河北省地震灾害防御与风险评价重点实验室,河北三河065201 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《原子能科学技术》2022年第6期1060-1068,共9页Atomic Energy Science and Technology

基　　金：国家自然科学基金(51908379);河北省地震灾害防御与风险评价重点实验室开放基金(FZ213206);辽宁省科技厅科研项目(2019JH2/10300054);沈阳市科技局科研项目(1900329)。

摘　　要：核电厂等重要基础设施的抗震设计和评估需要考虑竖向地震动影响,目前竖向地震动对核电安全壳地震易损性影响研究还较少。本文进行了考虑竖向地震动影响的核电安全壳地震易损性研究,分析了以水平向场地相关谱为目标谱选取的地震动记录的不足,提出了同时匹配水平和竖向场地相关谱的地震动选取方法,选取了指定场址的水平和竖向地震动记录。采用增量动力分析方法,基于选取的水平和竖向地震动,分别进行核电安全壳水平向地震动作用下与水平和竖向地震动联合作用下的易损性分析。采用基于混合易损性数据的易损性分析方法,得到了具有置信度的易损性曲线和高置信度低失效概率。分析结果表明:竖向地震动对安全壳抗震能力和地震易损性有较大影响。Horizontal and vertical ground motions should be considered for both seismic design and evaluation of critical infrastructures such as nuclear power plant structures.Seismic capacity of the nuclear containment under horizontal ground motions has widely been studied.However,the effect of vertical ground motions on seismic fragility analysis of the nuclear containment has been little studied.Meanwhile,there are usually two methodologies for selecting horizontal and vertical ground motions:1)horizontal ground motions and associated vertical ground motions are selected via the methodology making horizontal ground motions match horizontal target spectra;2)vertical ground motions and associated horizontal ground motions are selected via the methodology making vertical ground motions match vertical target spectra.However,two above-mentioned selection methodology could not make horizontal and vertical ground motions simultaneously match horizontal and vertical site-specific target spectra.This paper proposed a selection method making ground motions simultaneously match horizontal and vertical ground motions and investigated the effect of vertical ground motion on seismic fragility analysis of a CPR1000 nuclear containment:The limitation of selection methodology of horizontal and vertical ground motion based on horizontal target spectrum was analyzed;An efficient algorithm was proposed for selection of ground motions by making horizontal and vertical ground motions simultaneously match associated horizontal and vertical site-specific spectra;Horizontal and vertical ground motions were selected for a specific site located in China via the proposed method of this paper;Fragility analysis under only horizontal ground motions and under both horizontal and vertical ground motions were respectively analyzed via incremental dynamic analysis;Fragility analysis with confidence under only horizontal ground motions and under both horizontal and vertical ground motions were respectively performed via safety factor method;Finally,frag

关 键 词：水平和竖向地震动 安全壳 地震易损性 增量动力分析 水平和竖向场地相关谱 

分 类 号：TL364[核科学技术—核技术及应用]