土-地下结构的非线性动力相互作用——理论及应用

基于土-结构动力相互作用理论，阐述了土-地下结构非线性动力相互作用的基本原理及其建模方法。根据这一方法，对1995年日本阪神地震中震害最为严重的大开地铁车站进行了成灾机理有限元数值模拟分析。分析结果表明：在地震动作用下，车站结构顶板与侧墙的交叉部位，和中柱的顶底端首先发生弯曲破坏而形成塑性铰，使得顶板上覆土的大部分重量传递到由中柱来承担；在由顶板破坏后传来的上覆土重力和地震动在中柱中引起的压应力的共同作用下，中柱发生压曲和弯曲的双重破坏，导致中柱倒塌，进而导致车站顶板塌陷；同时还表明，水平向地震作用仍是造成大开地铁站结构破坏的主要因素。

Nonlinear dynamic interaction between soil and underground structure: theory and application

Based on the theory of soil-structure interaction,the theory of soil-underground structure nonlinear dynamic interaction and its analysis model are studied in this paper.By using the analysis model,the damage to Dakai subway station are analyzed.It proves that: flexural failures are detected in junctions of the station's roof and wall and the damaged junctions become plastic hinges.Accordingly,those columns of the station must bear the weight of overlying soil caused by upper plate's damage.However,these columns are also damaged under earthquake at its's top and bottom.At last,the columns in Dakai subway station are crushed or bended in earthquake, thereby,the upper plate of station is collapsed.At the same time,it is shown that the horizontal component of earthquake action is the main dynamic load to cause the severe damage of Dakai subway station.