基于土-结构相互作用的高层建筑三维地震反应分析

3D Seismic Response of Tall Building Based on Soil-structure Interaction

基于刚性地基假定的工程结构抗震计算方法未充分考虑场地土对结构地震反应的影响。为验证土-结构相互作用对高层建筑三维地震反应的影响,本文针对某双塔高层建筑,分别建立了单塔上部结构、双塔整体结构以及土-结构相互作用共同工作三维有限元模型。研究对比了各结构体系的动力特性,并通过地震弹性时程反应分析法进行了结构体系三维地震反应分析与对比。结果表明,在考虑土-结构相互作用以后,结构体系频率、加速度反应峰值有所降低,结构位移增大,结构内力出现降低的趋势。因此,对于建立在深厚非基岩地基土上的较高或刚度较大的高层建筑,抗震分析时考虑土-结构相互作用的影响是必要的。

The calculation methods of structure seismic response based on the assumption of rigid foundation had not considered the influence of site soil sufficiently.In view of one double-tower tall building,the 3D finite element models of single-tower structure,double-tower structure,integrated soil-structure interaction system are established respectively in order to verify the influence of the 3D seismic response of tall building considering soil-structure interaction.The dynamical characteristics contrastive analysis is made,and 3D seismic response contrastive analysis through the method of elastic time-history response of systems is also made.The results show that in consideration of soil-structure interaction,the frequency and the peak value of acceleration response of structure are reduced,the displacement of structure is increased,and the internal force of structure are also reduced.So considering the influence of soil-structure interaction in seismic response analyzing is necessary for the tall or more rigid structures established on the thick soil ground foundation.