地铁车站结构地震反应模拟分析

Seismic Response Simulation Analysis of Subway Station Structures

应用ABAQUS有限元分析软件对天津市滨海新区不均匀软土场地地铁车站在地震作用下的反应进行模拟分析,从车站抗震性能、土-地铁车站结构位移、有无地下连续墙存在时的地铁车站结构应力及土-地铁车站结构动力相互作用等方面展开研究。研究结果表明:覆土层厚度对地铁车站结构应力、应变有一定影响,设计时应充分考虑;地震作用下,车站中柱底部及中层楼板应力较大,且柱与楼板交接点范围内应力较大;不考虑地下连续墙影响时,地铁车站结构位移及应力均明显增大,不利于结构抗震设计。

In this paper,ABAQUS finite element analysis software is used to simulate the characteristic response of subway station under earthquake in a non-uniform soft soil site in Binhai New Area of Tianjin.The seismic performance of subway station structure,the displacement of soil and subway,the stress response of subway structure with or without diaphragm wall and the dynamic interaction of soil-station structure are discussed.The results show that the thickness of the overlying soil layer has a certain influence on the stress and strain of the subway,and the thickness of the overlying soil layer should be fully considered in the design.Under seismic load,the stress of the bottom and middle floor of the central column of the station is relatively large,and the stress of the junction point between the column and the floor of the subway structure is also relatively large.When the diaphragm wall is not considered,the displacement and stress of the subway structure increase obviously,which is not conducive to the seismic design of the structure.