摘要
核电厂厂房群是由多个相互紧邻的建构筑物组成的,在地震作用下,厂房群之间的结构-土-结构相互作用(SSSI效应)通过地基传递,使得相邻厂房之间相互影响。本文基于某三代核电堆型核安全相关的抗震I类厂房选取研究对象,以核岛厂房和消防泵房为目标厂房,分别建立了厂房群和单独厂房的三维实体有限元模型,采用基于频域求解的子结构法,选取软土和硬岩两种地基,对比不同地基条件下厂房群和单独厂房时目标厂房的楼层反应谱,开展SSSI效应对厂房地震响应的影响研究,分析采用的地震输入保持一致。分析结果表明:SSSI效应对楼层反应谱的谱形无影响,相比硬岩地基,软土地基条件下SSSI效应对厂房楼层反应谱值的影响更大;SSSI效应对大体量核岛厂房地震响应的影响有限,而对小体量的消防泵房影响更显著,峰值加速度和零周期加速度差异比绝对值最大分别可达13%和10%;此外,SSSI效应主要对在地震传播方向上构成SSSI传力体系的小体量厂房产生显著影响。
A nuclear power plant(NPP)usually consists of multiple structures that are adjacent.Under earthquake excitation,the structure-soil-structure interaction(SSSI)effect is transmitted among the adjacent structures through the site.Based on the seismic I class structures of a third generation NPP,the nuclear island structure and fire pump house were chosen as the research objects.The 3D finite elements of structure group and single objective structures were built,respectively.The substructure method based on frequency domain was adopted.The soft soil site and hard rock site were selected in the research.By comparing the floor response spectra(FRS)of the objective structures under these two site conditions,the influence of SSSI effect on the seismic response of the objective structures was studied.The seismic inputs were the same in the analysis.The results show that the SSSI effect does not change the shape of the FRS.The influence of SSSI effect on FRS of structure group with soft soil condition is larger than that with hard rock soil.The SSSI effect on seismic response of the larger nuclear island structure is negligible,while on that of the smaller fire pump house is significant.For fire pump house,the maximum of the absolute value of the difference ratio about peak acceleration and zero-period acceleration can reach 13%and 10%,respectively.In addition,the SSSI effect has significant influence on the smaller structure in the direction,where the structure group forms SSSI system in the direction of seismic propagation.
作者
甘莹莹
王东洋
杨建华
孙晓颖
GAN Yingying;WANG Dongyang;YANG Jianhua;SUN Xiaoying(Research Center for Nuclear Safety Related Structural Engineering and Technology,China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China;Building and Structure Institute,China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China)
出处
《建筑结构》
北大核心
2023年第S02期767-773,共7页
Building Structure
关键词
核电厂
厂房群
地基
结构-土-结构相互作用
楼层反应谱
nuclear power plant
structure group
site condition
structure-soil-structure interaction
floor response spectrum
作者简介
第一作者:甘莹莹,硕士,工程师,主要从事核电厂结构抗/隔震技术研究,Email:1534090690@qq.com;通信作者:孙晓颖,硕士,研究员级高级工程师,国家一级注册结构工程师,主要从事核电厂结构抗/隔震技术研究,Email:sunxy@cnpe.cc。
