Simulating the Seismic Response of Concentrically Braced Frames Using Physical Theory Brace Models

作     者：Liang Chen Lucia Tirca 

作者机构：Department of Building Civil and Environmental Engineering Concordia University Montreal Canada Department of Civil Geological and Mining Engineering Ecole Polytechnique Montreal Canada 

出 版 物：《Open Journal of Civil Engineering》 (土木工程期刊（英文）)

年 卷 期：2013年第3卷第2期

页      面：69-81页

学科分类：08[工学] 081402[工学-结构工程] 081304[工学-建筑技术科学] 0813[工学-建筑学] 0814[工学-土木工程] 

主　　题：Brace Model Plastic Hinge Hysteretic Energy Seismic Response Time-History Analysis 

摘      要：The aim of this paper is to assess the accuracy of brace models formulated in Drain 2DX and OpenSees by comparing the simulated results with those obtained from experimental tests. Both, Drain 2DX and OpenSees rely on the physical theory brace model. In this study, experimental tests conducted on the behaviour of structural hollow section braces subjected to symmetric and asymmetric quasi-static cyclic loading were selected for calibrating the numerical model. In addition, the predicted failure strain parameter resulted from a proposed empirical equation as a function of slenderness ratio, width-to-thickness ratio and steel properties was used to define the low-cycle fatigue material that was assigned to model braces in OpenSees. It is concluded that both Drain 2DX and OpenSees brace models give a good prediction in terms of maximum tensile and buckling force, as well as interstorey drift. However, in Drain 2DX, the brace model is not able to replicate the out-of-plan buckling and the braced frame model cannot provide an accurate response when the system experiences highly nonlinear demand. To emphasise the differences in performance between Drain 2DX and OpenSees, the behaviour of a 4-storey concentrically braced frame with zipper bracing configuration, located in Victoria, BC, was investigated.