场地剪切波速对核电厂结构地震响应的影响  

Effect of Site Shear Wave Velocity on Seismic Response of Nuclear Power Plant Structure

作　　者：李小军 王芳[1,2] 杨建华 陈苏 LI Xiaojun;WANG Fang;YANG Jianhua;CHEN Su(Institute of Geophyvsics,China Earthquake Administration,Beijing 100081,China;China Nuclear Power Engineering Co.,LTD.,Beijing 100840,China;College of Architecture and Civil Engineering Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中国地震局物理研究所,北京100081 [2]中国核电工程有限公司,北京100840 [3]北京工业大学建筑学院,北京100124

出　　处：《防灾减灾工程学报》2021年第6期1195-1201,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51738001,51421005)资助。

摘　　要：利用土-结相互作用的ACS SASSI动力分析程序,对某核电厂厂房建立三维有限元模型并进行地震响应计算,与简化的集中质量杆模型的地震响应对比分析,得到在水平方向上二者的振动特征相似,但三维有限元模型能更真实地反映结构的动力特性,尤其是竖向的局部模态。在场地剪切波速400~2 400 m/s时,选取9种不同剪切速值,用ACS SASSI程序进行不同场地条件下核电厂房结构地震响应计算分析。结果表明,随着场地剪切波速的增大,结构响应的卓越频谱成分有向高频移动的趋势;在低频部分,剪切波速较小的场地上结构地震响应较大;在高频部分,场地剪切波速较大的结构地震响应较大;对于非基岩场地的厂址,需要重视结构的低频反应。在一定的剪切波速范围内,结构响应的峰值加速度和反应谱的峰值均随着场地剪切波速的增大而增大,而峰值加速度对于剪切波速小的场地更为敏感。Three-dimensional finite element model of a nuclear power plant structure was established and the seismic response simulation of the model was carried out by the ACS SASSI software for 3 D dynamic analysis of the soil-structure interaction. Compared with the simplified lumped-mass stick model,the three-dimensional finite element model can more truly reflect the dynamic characteristics of the structure,especially the local vertical modes of the structure,although the vibration characteristics of the two models are similar in the horizontal direction. Nine different shear velocity values in the range of 400-2400 m/s were selected for the seismic response of nuclear power plant structure under different site conditions by the ACS SASSI software. The results show that:with the increase of site shear wave velocity,the predominant spectrum components of the structural response have the tendency to move to the high frequency section;in the low frequency part,the seismic response of the structure on the site with small shear wave velocity is larger;in the high frequency part,the seismic response of the structure with large shear wave velocity is larger;for non-bedrock site,it is necessary to pay attention to the low-frequency response of the structure. In a certain range of shear wave velocity,the peak acceleration and the peak value of floor response spectrum of the structural response increase with the increase of the site shear wave velocity,and the peak acceleration is more sensitive to the site with smaller shear wave velocity.

关 键 词：核电厂 结构地震响应 土—结构相互作用 抗震分析 剪切波速 

分 类 号：TU352.11[建筑科学—结构工程] TU38