考虑土-结构相互作用时地铁高架车站结构横向地震反应分析

Transverse Seismic Responses of an Elevated Metro Station Considering Soil-Structure Interaction

摘要:

基于ABAQUS软件平台，建立了土-桩-高架车站结构非线性动力相互作用的整体有限元分析模型，考虑输入地震动的频谱特性，系统分析了地铁某上部高架车站结构的横向地震反应规律，给出了不同地震条件下车站结构地震横向变形、结构加速度反应和柱底动内力反应程度及其规律。结果表明：由于高架车站结构顶层质量集中较为严重，使得上层结构的动力反应明显大于下层结构，尤其是上层柱底的最大剪力和弯矩都大于下层柱底的对应值。同时，具有明显近场地震动脉冲特征的地震波更易增强结构的地震反应。分析结果能为类似轨道交通高架车站结构的地震反应分析和抗震设计提供有效的参考和指导。

Abstract:

In this work, an overall finite element model, considering the nonlinear dynamic interaction of soil-pile-evaluated station structure systems, was established with the software ABAQUS. The transverse seismic performance of an elevated metro station was systematically analyzed, considering the spectral characteristics of input ground motions. Horizontal deformation and the acceleration response of the structure, and the dynamic internal force response at the column bottom were obtained and analyzed. The results showed that the dynamic response of the superstructure of the elevated station was stronger than that of the understructure, especially the maximum shear force and bending moment at the column bottom. Meanwhile, earthquake waves with obvious near-field pulse-like characteristics should more easily enhance the seismic response of the elevated structure.