设备-高层结构-地基土体系交互计算方法

提出了模拟设备-高层结构-地基土体系振动台实时子结构试验的数值交互计算方法,并且结合地基土在强震作用下并非全部进入非线性的特点,认为可尝试将具有局部非线性特点的地基土模型作为数值子结构、设备-高层结构体系作为试验子结构,从而在振动台实时子结构试验中考虑地基土非线性特性影响。采用分支模态子结构法与线性-非线性混合约束模态子结构法推导了设备-高层结构-局部非线性地基土体系的运动方程。选用一幢13层钢框架设备-高层结构-地基土体系模型作为分析实例,采用MATLAB与ANSYS分别建立设备-高层结构体系与局部非线性地基土计算模型,两者之间进行数值交互计算,发现土-结构相互作用与设备的频率变化对设备与结构的地震反应有重要的影响。

Interactive numerical calculation method of equipment-high rise structure-soil system

An interactive numerical calculation method to simulate the real-time substructure shaking table testing for the equipment-high rise structure-soil system was proposed. Considering that the soil is not completely nonlinear under strong earthquakes, locally nonlinear soil model was adopted as the numerical substructure in order to consider the influence of nonlinear soil during the substructure testing. Meanwhile, the equipment-high rise structure system was adopted as the experimental substructure. Then, equations of motion for the equipment-high rise structure-locally nonlinear soil system was derived using the branch modal substructure method and the linear-nonlinear hybrid constraint modal substructure method. A thirteen-layer steel framework system model was used as an analytical example, that the equipment-high rise structure system and locally nonlinear soil computing model were built by MATLAB and ANSYS respectively. Data communication occurred between two parts. Through the numerical result, it is found that the soil-structure interaction(SSI)and the frequency change of equipment have important influences on the seismic response of equipment and structure.