基于FE-IBE耦合方法的地铁车站抗震分析  

Seismic analysis of subway station by a FE-IBE coupling method

作　　者：朱俊 梁建文[1,2] ZHU Jun;LIANG Jianwen(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300354;Department of Civil Engineering,Tianjin University,Tianjin 300354,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300354 [2]天津大学建筑工程学院土木工程系,天津300354

出　　处：《地震工程与工程振动》2018年第4期111-116,共6页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51578372)~~

摘　　要：提出了地下结构非线性地震响应分析的一个FE-IBE耦合方法,通过等效线性化分析考虑土体非线性特性。该耦合方法的特点之一是有限元子域和间接边界元子域相互独立,非常适合并行计算,提高计算效率;特点之二是能够同时考虑近场区域(有限元子域)和远场区域(间接边界元子域)的土体非线性。通过与FLUSH和ANSYS的计算结果相比较,验证了本文耦合方法的正确性和计算精度。以天津某深厚软土场地中双层地铁车站为例,比较分析了土体线性和非线性两种工况下车站结构的地震内力和层间变形。本文算例中,非线性情况下车站结构最大弯矩和层间变形较线性情况均增大近50%。This paper aims to propose a more efficient Finite Element-Indirect Boundary Element（ FE-IBE） coupling method for seismic analysis of underground structures. And equivalent linear analysis is incorporated in this coupling method to account for the effects of soil nonlinearity. The particular advantage of the proposed coupling method is that it allows independent calculations of the FE subdomain and the IBE subdomain. Thus,the soil nonlinearity in both near field（ the FE subdomain） and far field（ the IBE subdomain） can be considered with avoiding interactive computations between the two subdomains. The FE-IBE coupling method is validated by comparison with results by FLUSH and ANSYS. Seismic responses of a two-story subway station in soft soils in Tianjin are studied,as an example. It is shown that the soil nonlinearity may lead to evident increase in the maximum bending moment as well as the deformation of the subway station,by about 50%.

关 键 词：FE-IBE耦合法 土体非线性 等效线性化 地铁车站 地震响应 

分 类 号：TU93[建筑科学—结构工程]