土-结构体系的混合约束模态法在ANSYS中实施研究

为了使提出的线性-非线性混合约束模态综合法能在商业软件中得到应用,本文对该方法在ANSYS软件中的运用进行了研究。对ANSYS中的超单元进行了深入分析,将线性-非线性混合约束模态综合法线性部分的处理作为超单元生成的过程,并根据基于势能判据的截断模态准则,运用Matlab自编了程序,求得子结构的截取主模态数,对存在局部非线性的土-高层框架结构相互作用进行了地震反应分析;进而对采用粘弹性人工边界与自由边界状况进行了比较,讨论分析了两种土体边界对线性-非线性混合的约束模态综合法自由度缩减的影响。

Application Research of the Mixed Constrained Mode Synthesis Method of Soil - Structure System in ANSYS

In order to research the applicability of the mixed linear-nonlinear constrained mode synthesis method in commercial software, this contribution presents this method in ANYSYS software. The super element in ANSYS is analyzed, and the linear part of the mixed linear-nonlinear constrained mode synthesis method is processed as generation process of super element. In order to capture the cut main modal number in the substructure, the program of Matlab is compiled according to the mode cut-off criterion based on potential energy criterion. And seismic analysis of soil-high-rise frame structure interaction that exist local nonlinear is carried. The comparison of structure with the viscoelastic artificial boundary and structure with free boundary condition is conducted. The discussion on the influence of the two kinds of soil boundary to the reduced freedom degrees of the mixed linear-nonlinear constrained mode synthesis method is proposed.