现有等效线性化分析程序在实际软场地计算结果方面的比较  

Comparison of existing equivalent linear analysis program in calculation results of actual soft site

作　　者：李晓飞[1] 孙锐[1] 袁晓铭[1] 李波[2] 

机构地区：[1]中国地震局工程力学研究所,中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]沈阳新大陆建筑设计有限公司,辽宁沈阳110179

出　　处：《自然灾害学报》2015年第4期56-62,共7页Journal of Natural Disasters

基　　金：国家科技部地震行业专项(201308015);黑龙江省留学归国基金项目(LC2013C14);国家自然科学基金项目(51278472)

摘　　要：SHAKE2000和LSSRLI-1分别是目前国外和国内广泛使用的两种一维等效线性化土层地震反应分析程序，分析二者之间的异同性及其与实测记录的差异程度，可为改进土层地震反应分析方法提供基础。收集整理了日本KiK-net台网中17个软场地（Ⅲ、Ⅳ类场地）39次地震的基岩及地表地震动记录，其中基岩加速度峰值在6∽214Gal之间，土层非线性取3种情况，采用SHAKE2000和LSSRLI-1两种程序分别进行了土层地震反应计算，从地表峰值加速度、加速度反应谱、加速度反应谱谱值比以及土层最大剪应变4个方面进行了对比计算。研究表明：当土体非线性不强时，SHAKE2000和LSSRLI-1计算出的PGA结果差异多数可忽略，计算出的土体剪应变最大值误差也多数小于20％；当土体非线性较强时，仅有少数差异可忽略，计算出土体剪应变最大值误差则多数大于20％；SHAKE2000的结果和LSSRLI-1与实测峰值加速度和反应谱多数情况下差异较大，土体弱非线性下LSSRLI一1结果稍好于SHAKE2000的结果，土体非线性较强时SHAKE2000的结果要好一些。SHAKE2000 and LSSRLI-1 are currently the two widely used programs respectively aboard and at home for one-dimensional equivalent linearized seismic response analysis of soil layer. Analysis of difference and common point between the both programs and the difference degree of results calculated from these programs and actually measured may provide a basis for improvement of seismic response analysis method. The bedrock and surface ground motion records of 39 earthquakes were collected in this article from 17 soft sites at KiK-net network station, Japan. The peak ground acceleration of bedrock is from 6 Gal to 214Gal. Using current equivalent linear programs Shake2000 and LSSRLI-1 for site seismic response analysis, the values as surface peak acceleration, acceleration response spectra, the ratio of acceleration response spectra and the maximum shear strain of soil were calculated comparatively for seismic response of soil layer. The analytical results show that, for weakly-nonlinear soil, diver- gences of the PGA calculated by Shake2000 and LSSRLI-1 can be ignored for most cases. Besides, the error of ealculated maximum value of soil shear strain is less than 20% in most cases. For strong-nonlinear soil, however, di- vergences of the PGA calculated by Shake2000 and LSSRLI-1 should not be ignored for most cases, the error of calculated maximum value of soil shear strain is more than 20% in most cases. The peak acceleration and response spectra calculated by Shake2000 and LSSRLI-1 have considerable difference with measured ones. For weakly-non- linear soil, the results calculated by LSSRLI-1 are better than those by Shake2000. While for strong-nonlinear soil, the opposite is the case.

关 键 词：土层地震反应分析 软土场地 KiK-net LSSRLI-1 SHAKE2000 强震记录 

分 类 号：P315.9[天文地球—地震学]