地基-筒体结构的地震反应分析

Earthquake Response Analysis for Foundation Tube Structures

采用子结构法对地基高层筒体结构进行地震反应分析．地基阻抗采用拟合数值结果得到的近似公式，上部结构采用有限条法计算结构侧向刚度矩阵，综合考虑基础与结构的动力平衡条件导出地基结构耦合系统的运动方程．文中对一栋２１层筒中筒结构进行了地震反应分析，讨论了不同场地，不同地震输入以及基础埋深等因素对结构地震反应的影响．

The earthquake response analysis for foundation tube structures is performed by using the substructure method. The approximate formulas for the foundation impedances are adopted which are obtained by fitting mathematical expressions to accurate numerical solutions.The transverse stiffness matrix of the upper structure is calculated by the finite strip method.The equation of motion of the foundation structure system is derived by considering the dynamic equilibrium of the foundation and the structure.The response analysis for a 21 floor tube in tube structure is performed and the effects of some factors such as different sites,different earthquake inputs and embedment depth on the response of the structure are discussed.