基于子结构法的地铁车站地震反应分析

对1995年日本阪神地震中地铁车站的破坏情况进行了调查，深入分析了地铁车站的地震破坏机理。采用二维子结构分析方法（SASSI2000）分别对水平向和竖向地震动作用下神户大开地铁车站的地震反应进行了数值模拟分析。在建模时把地铁车站上方的土体作为车站的附属结构，首先采用SHAKE91程序计算自由场土体的动剪切模量和阻尼比，在SASSI2000中不再考虑土体的非线性。将计算结果与1995年阪神地震中该车站的震害进行了详细地对比分析发现所得的地震反应规律与其震害完全吻合，其计算结果能够合理的解释神户大开地铁车站的各种震害现象。因此，对地下车站的抗震设计具有一定的参考价值和指导意义。

Analysis of earthquake response of subway station based on substructuring subtraction methods

The damages to Dakai subway station in 1995 Hyogoken-nanbu earthquake are analyzed in detail. The earthquake response of Dakai subway station is modeled by the 2-D substructuring methods (program SASSI2000, developed by John Lysmer et al.) with ground motions inputted in different directions. In this method, the dynamic soil-structure interaction is considered; and the effect of soil nonlinear dynamic property is considered by equivalent linearization model (program SHAKE91, developed by Schnabel et al.). The soils above the subway are considered as an affiliated structure of subway. The results prove that the model used is validation and the collapse of the columns in Dakai station was induced by both of the horizontal and vertical vibrations. The dynamic response of Dakai subway station calculated in this paper accorded well to all kinds of damages caused by the 1995 Hyogoken-nanbu earthquake.