求解地基-结构系统运动方程的基本频率法

Fundamental Frequency Method for Solving Motion Equations of Soil Structure Systems

地基动力阻抗的频率相关性，导致地基－结构系统运动方程的刚度矩阵和阻尼矩阵是运动频率的函数．本文考察求解这类方程的一种近似方法的有效性．算例表明，对于采用箱、筏类基础的高层建筑，近似方法既简单又十分有效．

The frequency dependence of the dynamic impedance of soil results in the fact that the stiffness and the damping matrix of the motion equations of soil structure systems are the functions of the motion frequences.The effect of an approximate method for solving such equations is examined.The examples show that the approxiamte method is simple and very effective for the highrise buildings with box or raft foundations.