双塔楼大底盘高层建筑-基础-地基地震动力相互作用分析

Dynamic interaction analysis of twin-towers high-rise building structure with enlarged base-foundation-soil system under earthquake

采用三维有限元方法建立了双塔楼大底盘高层建筑-厚筏基础-地基相互作用体系的动力分析模型,通过同比例增减某一参数的取值,分析了结构抗侧刚度、混凝土强度、楼板厚度和地基土刚度对双塔楼结构振动特性和地震响应的影响。结构抗侧刚度对结构动力响应的影响较大,地基土刚度和楼板厚度变化的影响次之。同时,通过与刚性基底假定的分析结果进行对比可知,土-结构之间的动力相互作用对结构动力响应的影响不容忽视。

The twin towers high-rise building structure with enlarged base-thick raft foundation-soil interaction system is modeled with 3D finite element model, with which the vibration characteristics and seismic responses of the system are analyzed. By regularly altering the parameters, such as lateral stiffness of the structure, thickness of floor plate and the stiffness of the soil, etc, the dynamic responses of the SSI system are calculated and compared with a symmetric twin towers high-rise building structure. The results show that the lateral stiffness of the structure has more remarkable influences on dynamic responses of the structure than the other parameters. At the same time, by comparing the results with that achieved from the rigid base supposition, it shows that the SSI can remarkably influence the dynamic responses of the struetar＇es and can not be overlooked.