近断层地震动对电厂主厂房的地震响应影响分析  

Effects of near-fault ground motions on seismic responses of a thermal power plant

作　　者：戴靠山 周裕洲 李波 钱雨凡 王健泽 DAI Kaoshan;ZHOU Y uzhou;LI Bo;QIAN Yufan;WANG Jianze(Department of Civil Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学土木工程系,四川成都610065

出　　处：《地震工程与工程振动》2020年第4期8-16,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(U1710111,51878426);中国电力建设股份有限公司科研项目(KJ-2016-095);中央高校基本科研业务费(2018)。

摘　　要：以某电厂主厂房为研究对象,以远断层地震动、近断层非脉冲地震动和近断层脉冲型地震动三组不同地震动作为输入,对主厂房钢支撑框排架结构开展弹塑性分析。对最大层间位移角、柱的残余位移、基底剪力等指标在不同地震强度下进行了统计对比。研究发现,在设防地震作用下,三类地震动引起结构响应差异不明显;在罕遇地震作用下,近断层脉冲型地震动引起的结构响应与远断层和近断层非脉冲地震动引起的结构响应差异显著。研究工作对电力厂房在近断层脉冲型地震动下的响应进行分析研究,通过对比说明考虑近断层脉冲型地震动对于电力厂房结构抗震分析的重要性。This study performed nonlinear time-history analyses to a steel braced frame structure of a power plant,in which three types of ground motions,i.e.,far-fault ground motions,near-fault non-pulse-like ground motions,and near-fault pulse-like ground motions were taken as input motions.Based on results of time history analyses,statistical analysis was conducted.This study further compared maximum interstory drift ratio,residual displacement of column and base shear of foundation under different seismic intensities.Results demonstrate that,there is no significant difference among three types of fortification earthquake induced structure response,and the rare earthquake causes a significant difference of seismic responses when the structure is subject to these three types of ground motions.By means of comparison,this essay researches on the response of near-fault pulse-like ground motions to state the importance of considering how near-fault pulse-like ground motions play a key role in seismic analysis of thermal power plants structure.

关 键 词：电厂主厂房 近断层脉冲型地震动 层间位移角 基底剪力 鞭鞘效应 残余位移 

分 类 号：P315.9[天文地球—地震学]