双塔高层钢结构抗震性能的有限元分析

针对高层建筑结构分析计算中专业设计软件在大震作用下结构弹塑性分析方面存在的缺陷,以北京某双塔高层钢结构为例,运用大型通用有限元软件ANSYS建立了结构三维模型,进行了结构的动力特性和模态分析,并采用振型分解反应谱和弹性/弹塑性时程分析方法,分析了该双塔高层钢结构在地震荷载作用下的结构响应.通过对计算结果的分析可以看出,通用有限元软件能够很好地对高层钢结构的抗震性能进行分析计算;双塔高层钢结构顶部鞭梢效应明显,建议通过减小顶部结构自重并在构造上予以重视加以解决.

Finite Element Analysis of the Seismic Properties of Two-Tower High-Rise Steel Structures

Because that the elasto-plastic calculation and analysis capacity of the professional structural design software for the structural behavior of high-rise buildings under severe earthquakes is not enough,this paper taking a practical two-tower high-rise steel structure in Beijing as an example,presented the details of using the large-scale general-purpose software ANSYS to create 3-dimensional finite element models to do a comprehensive analysis of the dynamic behavior and seismic properties of this steel structure,which included modal analysis,response spectrum analysis,elastic and elasto-plastic time-history analysis.The structural response of this two-tower high-rise steel buildings under the seismic load has been analyzed.By comparing the finite element analysis results,it can be concluded that the general-purpose finite element software can analyze and calculate the seismic behavior of high-rise steel structures very well;the whiplash effect of two-tower high-rise steel structures under seismic load is significant,and it is desirous to decrease the dead load of the structure top and to take special construction details in order to reduce this adverse influence.