一种用于场地-建筑群体系地震响应分析的二维耦合法

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (18) : 100-111.

论文

一种用于场地-建筑群体系地震响应分析的二维耦合法

韩冰1，梁建文2，杨晶丽2

作者信息 +

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

HAN Bing1，LIANG Jianwen2，YANG Jingli2

Author information +

文章历史 +

摘要

本文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（IBEM）模拟远场土体，采用有限元法（FEM）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，验证了本文耦合法计算准确，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，本文算例中放大率达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。

Abstract

A 2D coupled method for dynamic analysis of site-buildings system during earthquakes is developed in this study. In this method, the far field soil and near field soil is modeled by indirect boundary element method (IBEM) and finite element method (FEM), respectively, and the buildings are modeled by rigid foundations-blocks calculated by analytical solution. This coupled method requires relative small calculation as element discretization is not required in the buildings model, and moreover the structural parameters are simple and intuitive. In addition, as FE-IBE coupled method it can meet the radiation condition at infinity of the site without artificial boundary. The method is verified by comparison with published results. Numerical calculations are conducted to analyze the effects of site-buildings interaction on structural response at various locations. It’s shown that the effects of site-building interaction may increase 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 structure rigidity and similar with each other, the amplification of site-buildings interaction is significant, especially for the building in the center and it is up to 36.17% in our numerical cases. If buildings are arranged based on structural parameters (such as low-rise area, high-rise area), the site-buildings effect may have relatively larger effect on seismic response of the center building in each area.

导出引用

韩冰1, 梁建文2, 杨晶丽2. 一种用于场地-建筑群体系地震响应分析的二维耦合法[J]. 振动与冲击, 2023, 42(18): 100-111

HAN Bing1, LIANG Jianwen2, YANG Jingli2. 2D coupled method for the seismic analysis of a site-buildings system[J]. Journal of Vibration and Shock, 2023, 42(18): 100-111

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