筒体结构－桩－土相互作用的分枝模态－二步分析法

TWO STEP METHOD COMBINED WITH THE BRANCHED MODAL ANALYSIS FOR TUBE STRUCTURE-PILE-SOIL INTERACTION SYSTEM

将桩基模拟为各向异性弹性体，用分枝模态分析结构－桩－土空间结构体系，导出了解相互作用问题的分枝模态－二步分析法．即先对桩－土系统进行分析，将所得桩－土顶部加速度时程反应作为外荷输入基于刚基假定的结构，进行结构位移和内力分析．此方法计算规模缩小，解题灵活，适用于实际工程的抗震分析。

This paper presents a two-step method for structure-pile-soil interaction system analysis which is based on the branched model analysis and the theory that soil-pile-system is simulated as a unisotropic elastic medium. This method has the advantages of less computational quantity, and great flexibility for the analysis of structure-pile-soil interaction system. The calculational examples show that the present method gives satisfactory results and is suitable for actual engineering practice.