标题: 次结构法分析土壤-结构互制行为
Analysis of Soil-structure Interaction by Sub-structure Method
作者: 罗博智
刘俊秀
Gin-Show Liou
土木工程学系
关键字: ABAQUS;次结构法;ABAQUS;sub-structure;soil-struture interaction
公开日期: 2003
摘要: 一般耐震工程设计均以刚性地盘进行分析,然而在过去许多案例皆显示出土壤-结构之间的互制效应确实存在,此效应不但与土壤有关,亦受结构物动态特性、基础几何形式等诸多因素所影响,使得刚性地盘假设并不能完全适用于结构物受震反应时的分析。
因此,本研究以次结构法,推导出简单的土壤-结构互制效应的分析模式。首先以有限元素软体ABAQUS求出土壤-基础的阻抗矩阵,继而以模态分析法推导出上部次结构物的运动方程式后,与下部结构物于力平衡、位移一致下结合,得到土壤-结构互制效应的控制方程式并进行分析。
研究结果显示,在考虑土壤-结构互制效应下,历时反应较小,显示出在某些情况下,以往的刚性地盘分析下,有过于高估其反应的情况,但并非所有的情况皆如此,端视结构物的周期、地震反应谱、土壤-基础阻抗的大小而定。
For the analysis of structure subjected to seismic excitation, the foundations of the structure are usually assumed to be rigid. However, for some case this assumption may not be valid. Therefore, the paper is trying to derive a simple soil-structure interaction scheme by substructure technique, which can easily employ the existing commercial program.
In this method, the soil-structure interaction problem is solving in frequency domain, since the impedance matrix for foundation is frequency dependent. To obtain the impedance matrix, the commercial program ABAQUS of finite element method is employed. Since using finite element method to solve the problem of wave propagation in half-space medium, one must pay attention to some precautions that are element size and domain size of finite element method. These effects will be investigated.
After the equations of motion for soil-structure interaction analysis are derived and the impedance matrix is found. A numerical example of one seven-story building subjected to earthquake excitation is investigated in order to shed some light on soil-structure interaction effect on the responses of a building structure to seismic excitations.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT008916538
http://hdl.handle.net/11536/77458
显示于类别:Thesis


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