输入基岩地震波数量对土层地震反应影响研究  

Research on the influence of the number of input ground motion on soil seismic response

作　　者：赵晶 李建亮 王世元[3] 李福海[4] ZHAO Jing;LI Jianliang;WANG Shiyuan;LI Fuhai(Sichuan Vocational and College of Communications,Chengdu 611130,China;School of Civil Engineering,Sichuan Technology and Business University,Chengdu 611745,China;Earthquake Administration of Sichuan Province,Chengdu 610041,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]四川交通职业技术学院,四川成都611130 [2]四川工商学院建筑工程学院,四川成都611745 [3]四川省地震局,四川成都610041 [4]西南交通大学土木工程学院,四川成都611756

出　　处：《世界地震工程》2024年第3期94-102,共9页World Earthquake Engineering

基　　金：四川省科技计划项目(2020JDKP0066);四川交通职业技术学院科技教育发展基金项目(2023-YB-KJ-01)。

摘　　要：以成都某地铁站点工程场地为例,采用一维等效线性化方法,将人工合成的不同超越概率下各20条相互独立的地震波作为基岩输入地震动时程,进行了土层地震反应计算,并对计算结果进行了分析研究,得出结论:1)通过对土层地震反应结果的计算分析,给出了PGA、T_(g)和S_(a)(T)值计算结果参数的变异系数和随概率档的变化规律,并验证了上述各参数均值都服从正态分布。2)对于Ⅱ级和地震小区划工作,目前业内较为普遍地采用3条基岩地震波作为土层地震反应计算基岩输入地震动时程的做法和现行地震安评国标的规定,至少采用3条基岩地震波作为输入地震动时程下限数量的规定已不能满足要求,需要增加,建议增加到最少采用15条基岩输入地震波,以保证地震安评工作所提供的场地设计地震动参数更加可靠。Taking an actual project in Chengdu as an example,using one-dimensional equivalent linearization method,the calculation of soil earthquake response under the different numbers of the input ground motion has been carried out.The following conclusions are obtained:1)By calculating and analyzing the seismic response results,the variation coefficient of each parameter and the variation rule with probability are obtained,and the mean value of each parameter is verified to obey normal distribution.2)For CategoryⅡand earthquake microzonation work,the general practice of three bedrock seismic waves for soil seismic response analysis can not meet the practical demands at present,and the lower limit of three seismic waves for soil seismic response analysis in the current seismic safety assessment standard is not adequate.It is recommended that at least 15 independent synthetic bedrock seismic waves should be used as the input ground motion in soil seismic response.

关 键 词：输入地震动时程 样本数量 地震动参数 离散性 国标下限 

分 类 号：P315.9[天文地球—地震学]