（1 中冶建筑研究总院有限公司， 北京  100088； 2  北京工业大学工程抗震与结构诊治北京市重点实验室， 北京 100124； 3  国网北京经济技术研究院， 北京 102209）

［摘要］为研究布置普通钢支撑或防屈曲支撑结构在地震作用时的非弹性扭转问题，以某对称的框架-支撑结构为实例，加工设计了对比试验模型并进行振动台试验，同时建立某不规则工程结构的有限元对比模型并进行弹塑性时程分析。根据试验现象、层间扭转角曲线和构件内力变化等综合评价结构非弹性扭转效应。研究结果表明：即使在对称结构中也会出现非弹性扭转突增现象，而普通钢支撑压曲失稳是导致该现象的主要原因；防屈曲支撑能够有效减控结构非弹性扭转危害并改善承重构件内力分布情况。

［关键词］非弹性扭转； 钢支撑； 防屈曲支撑； 振动台试验； 有限元分析

中图分类号：TU391文献标识码：A文章编号：1002-848X(2019)17-0114-06

Analysis and experimental study on inelastic torsion effect of structures with different braces

Xu Jimin1,2， Xing Kuntao1， Gao Xiangyu2， Guo Xiaohua1， Li Jianqin3

(1 Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China;2 Beijing Key Lab of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China;  3 State Power Economic Research Institute， Beijing 102209, China)

Abstract:In order to investigate the inelastic torsion effect of structures with common steel braces or buckling restrained braces, comparative models were designed and processed with a symmetrical frame-braced structure as an example, and shaking table tests were carried out. Meanwhile, finite element comparison models of an irregular engineering structure were established and the elastoplastic time history analyses were carried out. The inelastic torsion effect of structure was comprehensively evaluated based on test phenomena, story torsion angle curve and internal force variation of components. The results show that, even in the symmetric structure, the phenomenon of inelastic torsion sudden increase would also appear, and the buckling of steel braces is the main cause of this phenomenon. The buckling restrained braces can effectively reduce the damage of inelastic torsion and improve the internal force distribution of bearing members.

Keywords:inelastic torsion; steel brace; buckling restrained brace; shaking table test; finite element analysis