无梁楼盖地铁车站结构抗震性能研究

Study on Seismic Performance of Subway Station Without Beam Floor Structure

为了解无梁楼盖地铁车站结构的抗震性能,基于ABAQUS软件开展三维非线性地震响应的数值模拟,分析了3种地震波不同峰值加速度作用下的反应特性,并与常规车站进行对比。结果表明,无梁楼盖地铁车站于小震时仍保持较好的抗震完整性,但大震下呈现出脆性破坏的特点,地震波的峰值加速度大小是导致车站结构震害程度的关键因素;2种车站结构的震害及加速度响应程度与输入的地震波类型关系密切;车站结构的加速度响应沿车站纵向具有空间效应;中柱对车站的抗震性能贡献不明显,是抗震的薄弱构件,通过改变中柱截面从而改善车站结构的抗震性能作用并不理想。

In order to understand the seismic performance of subway station without beam floor structure,Numerical simulate 3 D nonlinear seismic response based on ABAQUS software,analyse the response characteristics for 3 kinds of seismic waves with different peak acceleration,compared with the conventional station. The results show that the subway station without beam floor has good seismic integrity during small earthquakes,but under large earthquakes,present characteristics brittle fracture,the peak acceleration of seismic waves is the key factor leading to the structural damage degree of stations;the seismic damage and acceleration response of the 2 station structures are closely related to the type of seismic waves input;the acceleration response of the station structure has spatial effect along the longitudinal direction of the station;the contribution of the middle column to the seismic performance of the station is not obvious,is a weak member of the earthquake resistance,it is not ideal to improve the seismic performance of the station structure by changing the section of the middle column.