不同类型地震波作用下一体化车站结构地震响应分析

为了研究不同类型地震波作用下一体化地铁车站结构地震响应特性,基于ABAQUS软件建立地铁地下车站-土-地上建筑一体化结构大型三维有限元数值模型,利用典型的近、远场地震动记录,计算分析城市轨道交通枢纽一体化结构在不同地震动类型作用下的地震响应规律.结果表明:土-一体化结构体系与自由场地各阶自振频率较为接近,一体化结构的存在对场地土动力特性的影响较小,从工程的角度看可忽略不计;在土-一体化结构体系基频附近能量分布相对集中的地震波能够对一体化地铁车站结构的地震响应产生显著的影响;一体化地铁车站结构具有明显的空间效应,不同区域之间的地震反应差异明显,应该按照空间问题进行一体化地铁车站结构的抗震计算.研究成果对该类结构的抗震设计与分析具有一定的参考意义.

Seismic response analysis of integrated station structures under different types of seismic waves

In order to study the seismic response characteristics of the integrated subway station structure under different types of seismic waves, a large-scale three-dimensional finite element numerical model of the integrated subway station-soil-above-ground building structure was established based on ABAQUS software. Using typical near and far site vibration records, the seismic response laws of the integrated structure of urban rail transit hub under different types of ground motions were calculated and analyzed. The results show that the natural frequencies of soil-structure system and free site are close to each other, and the existence of integrated structure has little influence on the dynamic characteristics of site soil, which can be ignored from the engineering point of view. Seismic waves with relatively concentrated energy distribution near the fundamental frequency of the soil-integrated structure system can significantly affect the seismic response of the integrated subway station structure. The integrated subway station structure has obvious spatial effect, and the seismic responses between different regions are obviously different. Therefore, the seismic calculation of the integrated subway station structure should be carried out according to the spatial problem. The research results have certain reference significance for the seismic design and analysis of such structures.