框架结构-桩筏基础-地基共同作用的模态分析

The modal analysis for interaction of frame structure-piled raft foundation-soil

本文利用大型通用有限元软件ANSYS10.0建立了传统模型和共同作用的三维实体模型来研究框架结构-桩筏基础-地基共同作用时结构的固有特性,并通过改变结构的相关参数来分析其对结构固有特性的影响。对传统模型和共同作用模型进行模态分析比较得出,考虑共同作用后,结构的自振频率减小,自振周期延长;改变基础的刚度,对共同作用模型进行模态分析比较,结构的自振周期随基础刚度的增大而减小。

This article established a reasonable traditional FEA model and an interaction FEA model using the FEA software ANSYS 10.0. Based on the different parameters, under the interaction of frame structure-piled raft foundation-soil, the different influences were investigated, and the main results are following: With the analysis of modal of traditional model and interaction model, considering the interaction, it indicates that the frequency of the traditional modal reduces and the period extends. The period of interaction modal reduces with the increasing of rigidity of the foundation.