一种用于场地-建筑群体系地震响应分析的二维耦合法  

2D coupled method for the seismic analysis of a site-buildings system

作　　者：韩冰 梁建文[2] 杨晶丽 HAN Bing;LIANG Jianwen;YANG Jingli(School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China;School of Civil Engineering,Tianjin University,Tianjin 300354,China)

机构地区：[1]天津城建大学土木工程学院,天津300384 [2]天津大学建筑工程学院,天津300354

出　　处：《振动与冲击》2023年第18期100-111,共12页Journal of Vibration and Shock

基　　金：国家自然科学基金(51978462)。

摘　　要：该文章发展了一种用于计算场地-建筑群体系地震响应的二维耦合法,其中采用间接边界元法模拟远场土体,采用有限元法模拟近场土体,用解析算法的刚性基础-等效均质块体模型模拟建筑群。该耦合法的优势是建筑群无需离散单元,计算量小,结构参数简单直观,且无需人工边界即可满足场地无穷远处辐射条件。通过与已有文献结果对比,验证了该文章耦合法计算准确,精度较高。通过数值计算分析了场地-建筑群效应对结构动力响应的影响,研究表明:场地-建筑群效应可能明显放大结构地震响应幅值,这与整个场地-建筑群的特性及地震波特性有关;当建筑群中结构参数相同且结构刚度较大时,场地-建筑群效应可能对结构地震响应幅值的影响较大,尤其是处于建筑群中心位置的结构,该文章算例中放大率达36.17%;当建筑群将相同参数结构分区布置(如多层区、高层区)时,场地-建筑群效应可能对各区中心位置结构的地震响应幅值的影响较大。A 2D coupled method for the dynamic analysis of a site-buildings system during earthquakes was developed.In the method,the far field soil and near field soil were modeled by the indirect boundary element method(IBEM)and finite element method(FEM)respectively,and the buildings were modeled by rigid foundations-blocks calculated by an analytical solution.This coupled method requires only relatively small calculation amount,the element discretization is not required in the buildings model,and moreover the structural parameters are simple and intuitive.In addition,the FE-IBE coupled method can meet the radiation condition at infinity of the site without artificial boundary.The method was verified by comparison with published results.Numerical calculations were conducted to analyze the effects of site-buildings interaction on the structural response at various locations.It’s shown that the effects of site-building interaction may increase the structural response amplitude significantly,which is related with the characteristics of the whole site-buildings system and the seismic wave;in addition,if the buildings are characterized by great structural rigidity and similar with each other,the amplification action of site-buildings interaction is significant,especially for the building located at the center,which is up to 36.17%in our numerical cases.If buildings with the same structural parameters are arranged in one area(such as low-rise area,high-rise area,etc.),the site-buildings effect may have relatively larger influence on the seismic response of the center building in each area.

关 键 词：场地-建筑群效应 耦合法 地震响应 放大作用 土-结构动力相互作用 

分 类 号：TU435[建筑科学—岩土工程]