软土地铁车站结构形式对抗震性能影响的研究

为研究地铁车站结构的地震反应特性,结合上海某地铁车站的抗震性能分析,采用有限差分程序FLAC对车站的几种结构形式进行了数值模拟.研究结果表明:保持地铁车站截面的对称性对结构的抗震有利;当结构截面不能保持对称时,在截面形式突变的位置设置沉降缝,能够提高结构的抗震性能;车站与周边开发部位连接处侧墙的开孔尺寸对开孔处柱子及开孔下方车站连续墙内力影响显著.

Study on Aseismatic Ability of Subway Station on Soft Soil

In order to study the structure of complicated metro station seismic response features,combined with the seismic performance analysis of Shanghai Jiangwan metro station on the 10th line,several structural form is simulated by FLAC.The results show that when the cross section form is symmetrical,the aseismatic ability of the metro station can be improved; when not,the aseismatic ability of the structure can be improved too if settlement joint is installed in the section of mutation;for the narrow subway stations,when the structrue is divided into several segments at a certain distance along the longitudinal seam seismic settings,the internal force can be reduced effectively in the metro station under seismic loading forces,and the aseismatic ability of subway station can be improved;the effect of the size of the hole in juncture is remarkable on the pillar in the hole and the continuous wall.