地震作用下土-结构相互作用的简化时程分析  

Simplified Time History Analysis for Soil-Structure Interaction under Earthquake

作　　者：赵密[1] 王维伟 黄景琦 杜修力[1] 王君杰[3] ZHAO Mi;WANG Weiwei;HUANG Jingqi;DU Xiuli;WANG Junjie(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Civil Engineering,Tongji University,Shanghai 200922,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京科技大学土木与资源工程学院,北京100083 [3]同济大学土木工程学院,上海200922

出　　处：《防灾减灾工程学报》2022年第1期111-117,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(U1839201;51678015);教育部创新团队项目(IRT_17R03);北京市自然科学基金项目(JQ19029)资助。

摘　　要：基于黏弹性边界和将场地地震反应转化为等效荷载的有限元直接法是目前进行土-结构相互作用分析的常用时程分析方法之一。该方法具有严格的理论基础且计算精度较高,但在商业有限元软件中施加黏弹性边界和由场地反应确定的等效地震荷载时,需要使用者编制程序书写命令流文件。本文建议一种动力时程简化分析模型,即计算模型侧边界采用滚轴或绑定边界、底边界强制自由场反应。首先基于一维等效线性化场地反应分析软件EERA,明确了分别给定岩石地表记录、基岩记录和场地地表记录条件下,正确实现场地反应分析的做法,表明在相同地震下三种分析能够得到相同的场地反应结果;然后给出动力时程简化分析过程;最后通过一层两跨地铁车站的地震分析,表明该方法具有较高精度,满足工程需求。The direct finite element method is achieved by transforming the site response into the equivalent loading based on the viscous-spring boundary condition.It is one of the most common methods using time history analysis for soil-structure interaction analysis.This method is very accurate but users need to generate command stream files through programming based on commercial finite element software.In this paper,a simplified dynamic time analysis method,i.e.the roller boundary is applied at lateral boundaries and the bottom boundary are forced by the free field response that is obtained from one-dimensional(1D)site response analysis.Firstly,the site response analysis is done under the conditions of given rock surface,bedrock and site surface records respectively based on 1D equivalent linearization site response analysis,which shows that the same site responseresults can be obtained for the three analyses under the same earthquake.Then,simplified time analysis ispresented.Finally,the seismic analysis of a two-span subway station is presented,and the results indicate that the method has high precision and meets engineering requirements.

关 键 词：土-结构相互作用 动力时程分析 场地反应 滚轴边界 地震动输入 

分 类 号：TU443[建筑科学—岩土工程]