基于SAP2000的钢结构减震性能分析

何晓寒

摘 要：为了研究钢框架结构在增设屈曲约束支撑后的减震性能，本文以某高烈度地区钢框架结构为研究对象，并通过有限元软件SAP2000，分别对纯钢框架结构和加屈曲约束支撑的减震结构进行了模拟，并按规范要求选取了三条地震波，对其进行了动力特性分析以及动力响应分析。在动力特性分析中，通过对比两种结构的前三阶主振型，确定其平扭属性，发现其都满足规范要求，但增设屈曲约束支撑后，减震结构的抗侧刚度明显提高。在动力响应分析中，分别用反应谱法以及非线性时程分析法求解了两种结构的层间位移和层间位移角，发现加屈曲约束支撑的减震结构的层间位移角与层间位移都明显小于纯钢框架结构，减震效果明显。

关键词：减震;屈曲约束支撑;钢结构

中图分类号：TU352.11     文献标识码：A    文章编号：1003-5168（2021）21-0049-03

Analysis of the Shock Absorption Performance of Steel Structure Based on SAP2000

HE Xiaohan

（School of Civil Engineering and Communication， North China University of Water Resources and Electric Power， Zhengzhou Henan 450045）

Abstract： In order to study the shock absorption performance of steel frame structure with buckling restrained brace. In this paper， the steel frame structure in a high seismic intensity area is taken as the research object. Through the finite element software SAP2000， the pure steel frame structure and the damping structure with buckling restrained brace were simulated， and three seismic waves are selected according to the requirements of the code， the dynamic characteristic analysis and dynamic response analysis are carried out. In the analysis of dynamic characteristics， by comparing the first three main modal of the two structures， the flat torsion properties are determined， and it is found that both of them meet the requirements of the code， but the lateral stiffness of the damping structure is significantly improved after adding buckling restrained brace. In the dynamic response analysis， the inter-story displacement and inter-story displacement angles of the two structures respectively solved by response spectrum method and non-linear time history analysis method. Meanwhile， it found that the inter-story displacement angle and inter-story displacement of the damping structure with buckling restraint brace are significantly smaller than that of the pure steel frame structure， and the damping effect is obvious.

Keywords： shock absorption; buckling restrained brace; steel frame structure

隨着社会经济的快速发展，我国人口越来越多。为了节约土地，增加住房和居住人口，我国高层钢框架结构住宅迅猛发展。我国是地震多发国家，地震是最大的灾害之一，对人民的生命财产危害重大。为了减轻地震灾害的影响，大量减震装置因此产生，比如屈曲约束支撑[1]，屈曲约束支撑又称为防屈曲约束支撑（简称BRB）。有学者通过SAP2000有限元软件分析了加屈曲约束支撑结构的减震性能[2]。为进一步对纯钢框架结构和增设BRB的减震结构的减震性能进行对比分析[4]，本文分别建立了不加支撑的纯钢框架结构和增设BRB[3]的减震结构的有限元模型，求解了其动力特性以及动力响应，并进行了对比分析。

1 工程概况

本文研究对象的工程概况如下：该建筑采用钢框架结构体系，地上八层，见图1。该建筑设计使用年限为50年，抗震设防烈度是8度，设计基本地震加速度是0.2 g，建筑场地类别为Ⅲ类，特征周期为0.45 s，地震峰值加速度为0.3 g。