不同类型地震波作用下地下综合体结构地震反应分析

为探究不同类型地震波作用下地下综合体结构的地震反应特征，本文以上海某地下综合体为工程背景，采用ABAQUS软件建立土-地下综合体结构相互作用体系三维有限元模型，利用Davidenkov模型模拟土的非线性，以不同类型的单向地震波和双向地震波（含水平向和竖向）作为输入，对软土场地中地下综合体结构进行了地震反应分析，比较了不同类型地震波作用下地下综合体结构地震反应的差异，探讨了地下综合体结构的竖向地震动效应问题．本文的算例结果表明：在长周期地震波作用下地下综合体结构的位移响应和内力响应峰值均明显大于普通地震波作用下的结果；考虑竖向地震动时地下综合体结构的柱轴力较单一水平向地震动作用情形有明显增大；在本文地下综合体结构算例中，地下三层柱底、四层柱顶、五层柱底、以及底板与侧墙连接处为受力较大部位．

Seismic Response of Underground Complex Subjected to Different Types of Ground Motions

In order to uncover the seismic response characteristics of underground complex under different types of ground motions, a case study of an underground complex in Shanghai was conducted. In this paper, the 3D  soil -undergrounund structure interaction (SUSI) system was modeled and analyzed using the finite element code ABAQUS. The Davidenkov constitute model was used for soil nonlinearity. Different types of uni- and bi-directional (containing horizontal and vertical) seismic waves were selected from historical earthquakes as input motions to investigate the seismic response of underground complex at soft soil site. The differences in seismic response subjected to different types of ground motions were compared and the effects of vertical ground motions on the seismic behavior of underground complex were discussed. The results indicated that under long-period ground motions the peak displacement and internal force response of underground complex are larger than those under ordinary ground motions. The vertical seismic loads mainly result in an increase the column axial forces. For investigated underground complex structure in this paper, the bottom of columns on Basement 3, the top of columns on Basement 4, the bottom of columns on Basement 5, and the junctions between bottom slab and the side walls are points with high stress.