不同地震动作用下高层钢框架非线性时程分析

Analysis on Nonlinear Time History of High-Rise Steel Frame under Different Ground Motion

随着我国建筑技术的快速发展,高层钢框架建筑如雨后春笋般涌现,其抗震安全日益引起人们的重视。本文以典型高层钢框架结构为研究对象,应用MATLAB程序开发出高层钢框架结构整体有限元非线性计算模型,通过与软件ANSYS所建整体模型进行对比,发现两者计算结果无明显的差别,说明本文所建计算模型是可靠的。在此基础上,开展不同地震动作用下高层钢框架非线性时程分析,研究发现随着地震强度增大,钢框架的位移反应和底部剪力并非呈线性增大,特别是在天津波作用下部分楼层的位移反应存在突变的情况,因此开展高层钢框架非线性时程研究对于保证钢结构工程安全性有十分重要的现实意义。

With the rapid development of the building technology in our country,high-rise steel frame buildings have sprung up prosperously,and their seismic safety has attracted more and more attention.This paper takes the typical high-rise steel frame structure as the research object,and develops the integral finite element nonlinear calculation model of high-rise steel frame structure with MATLAB program.Compared with the overall model built by ANSYS,it is found that there is no significant difference in the calculation results between them,indicating that the calculation model built in this paper is reliable.On this basis,the analysis on the nonlinear time history of the high-rise steel frame under different ground motions is carried out.It is found that with the increase of earthquake intensity,the displacement response of the steel frame and the bottom shear force do not increase linearly.In particular,the displacement response of some floors under the action of Tianjin wave appears sudden change.Therefore,it is of great practical significance to study the nonlinear time history for ensuring the safety of steel structure engineering.