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（1 中冶建筑研究總院有限公司， 北京  100088； 2  北京工業(yè)大學工程抗震與結構診治北京市重點實驗室， 北京 100124； 3  國網北京經濟技術研究院， 北京 102209）

［摘要］為研究布置普通鋼支撐或防屈曲支撐結構在地震作用時的非彈性扭轉問題，以某對稱的框架-支撐結構為實例，加工設計了對比試驗模型并進行振動臺試驗，同時建立某不規(guī)則工程結構的有限元對比模型并進行彈塑性時程分析。根據試驗現(xiàn)象、層間扭轉角曲線和構件內力變化等綜合評價結構非彈性扭轉效應。研究結果表明：即使在對稱結構中也會出現(xiàn)非彈性扭轉突增現(xiàn)象，而普通鋼支撐壓曲失穩(wěn)是導致該現(xiàn)象的主要原因；防屈曲支撐能夠有效減控結構非彈性扭轉危害并改善承重構件內力分布情況。

［關鍵詞］非彈性扭轉； 鋼支撐； 防屈曲支撐； 振動臺試驗； 有限元分析

中圖分類號：TU391文獻標識碼：A文章編號：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