等效线性化方法计算深厚土层地震反应的可靠性研究  

Reliability of the seismic response analysis for deep soil sites using equivalent linear methods

作　　者：郭婷婷 陈龙伟[1,2] 吴晓阳 袁晓铭[1,2] 李瑞山 GUO Tingting;CHEN Longwei;WU Xiaoyang;YUAN Xiaoming;LI Ruishan(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,哈尔滨150080 [2]地震灾害防治应急管理部重点实验室,哈尔滨150080

出　　处：《振动与冲击》2023年第18期172-179,共8页Journal of Vibration and Shock

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目(2021EEEVL0104)。

摘　　要：深厚土层地震反应计算是工程抗震以及地震安全性评价工作中的一个难点,基于等效线性化理论的一维土层反应分析方法是当前土层地震反应计算的主流程序,但后者对前者计算结果的可靠性缺少系统的认识。选取日本KiK-net强震观测台网中30个覆盖层厚度大于50 m的台站场地和台站所记录的1218条地震数据,采用DEEPSOIL(DP)、LSSRLI-1(LS)、SHAKE2000(SHAKE)、SOILQUAKE(SQ)以及SOILRESPONSE(SR)等5款一维土层地震反应分析程序计算场地地表加速度及反应谱。通过标定加速度反应谱的3个特征参数(即峰值加速度(peak ground acceleration,PGA)、特征周期T_(g)和平台值β_(max))的计算值与实测值对比,评估5款土层反应计算程序的可靠性。分析结果表明:5款程序中SR计算PGA的准确率最高,SQ最低;T_(g)的计算结果各程序间差别不明显,SQ的准确率略高于其他程序;5款程序计算β_(max)的准确率基本无差别。计算特征参数准确率随着参数相对误差水平的增加而增大。分析结果可为采用等效线性化方法计算深厚土层场地地震反应的可靠性评价提供依据。The seismic site response calculation of deep soil is a challenging and difficult issue for the seismic design of engineering structures and also for the seismic hazard evaluation practice.One-dimension seismic site response analysis methods based on equivalent linear theory are the prevailing technique to calculate site responses.However,the reliability of equivalent linear methods for analysing deep soil responses has not been widely recognized.Selecting 30 strong-motion stations underlain by soil layers deeper than 50 m from the KiK-net strong-motion network in Japan,and colleting 1218 seismic data records measured by the stations,five seismic site response analysis programs,namely,DEEPSOIL(DP),LSSRLI-1(LS),SHAKE2000(SHAKE),SOILQUAKE(SQ)and SOILRESPONSE(SR)were adopted to calculate the surface accelerations and their response spectra.Comparing the calculated values of three characteristic parameters of standardized response spectra,i.e.,peak ground-motion acceleration(PGA),characteristic period(T_(g))and plateau value(β_(max)),with those of the records,the reliability of the calculation programs was evaluated quantitatively.The analysis results indicate that the accuracy of calculation by the SR program for PGA values is the largest while that by the SQ is the smallest.The difference of the calculation accuracy for T_(g) values is not significant even though the SQ exhibits a slight advantage over the others.The calculation ofβ_(max) values by the five programs keeps fairly consistent.The calculation accuracy increases with increasing the acceptable relative errors of the parameters.The analysis results presented are expected to evaluate the reliability of equivalent linear methods applied in deep soil response analysis.

关 键 词：等效线性化 深厚土层 标定反应谱特征参数 KiK-net 

分 类 号：P315.9[天文地球—地震学]