含无限刚性体结构的动力学特征与工程应用

除显含无限刚性段的振动体系外，结合动力问题有限单元法中的一致质量矩阵提出了隐性无限刚性的概念，以及由此引起的振动惯性耦合问题．结合地震作用下高层建筑与桩-土相互作用时的动力响应，提出了对于实际工程问题利用分支模态二步分析法建立计算模型时应注意的问题．

DYNAMIC CHARACTERISTICS AND ENGINEERING APPLICATION OF STRUCTURES CONTAINING INFINITELY STIFF MEMBERS

This paper deals with the dynamic characteristics of the structures containing infinitely stiff members, for which the vibration equations of the systems are usually inertially coupled. Combined with the element consistent mass matrix in finite element dynamic analysis, the concept of hidden infinitely stiff and relative inertial coupling is presented. The paper discusses some problems in setting up the computational models for dynamic response analyses of tall buildings, using a branched modal and taking pile-soil-superstructure interaction into account.