带间隙拉索保护的屈曲约束支撑受力性能研究*
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顾志超1,吴京1,王春林1,李铭2（1 东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 210096；2 南京市建筑设计研究院有限责任公司, 南京 210005）［摘要］提出并介绍带间隙拉索保护的屈曲约束支撑(GT-BRB)的构造和力学性能，详细推导了其各阶段的刚度特性。GT-BRB的刚度特性可视为普通BRB与带间隙拉索刚度特性的叠加，它在大变形时体现出显著的第三刚度特性，其卸载刚度特性与最大应变幅有关；在受压状态下体现出的第三刚度略小于受拉状态下的第三刚度。对一个安装有GT-BRB的两层结构建立模型并进行了有限元分析，结果表明GT-BRB有利于减小结构的薄弱层效应，可进一步提高框架抗倒塌能力。［关键词］GT-BRB; 构造方式; 刚度特性; 第三刚度; 抗倒塌能力中图分类号：TU323.2 文献标识码：A 文章编号：1002-848X(2013)19-0078-05Research on behavior of buckling-restrained brace with gapped tendon protectionsGu Zhichao1, Wu Jing1, Wang Chunlin1, Li Ming2(1 Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China; 2 Nanjing Architectural Design and Research Institute Co., Ltd., Nanjing 210005, China)Abstract: The detailing and behavior of the buckling-restrained brace with gapped tendon protections(GT-BRB) were promoted and introduced. Then the stiffness property of the GT-BRB was derived in detail. The stiffness property of the GT-BRB was the combination of the BRB and the gapped tendons, resulting in the significant third stiffness under large strain amplitude. The unloading stiffness of the GT-BRB was related with the maximum strain amplitude, and the third stiffness in compression is slightly smaller than that in tension. A two-storey structure with GT-BRB was used as a numerical example, exhibiting that the GT-BRB is beneficial to reduce the effect of softening storey and improve the collapse-resistant capacity of the structure.Keywords: GT-BRB; detailing; stiffness property; third stiffness; collapse-resistant capacity*国家自然科学基金（51278105，51008077），江苏省青蓝工程。作者简介：顾志超，硕士研究生，Email: guzhichao1989@163.com。参考文献［1］CHRISTOPOULOS C, TREMBLAY R, KIM H J, et al. Self-centering energy dissipative bracing system for the seismic resistance of structures: development and validation［J］. Structural Engineering, 2008, 134 (1): 96-107.［2］MILLER D J. Development and experimental validation of self-centering bucklingrestrained braces with shape memory alloy［D］. Urbana-Champaign：University of Illinois, 2011.［3］SHAWN K, UANG C M. Reducing residual drift of buckling-restrained braced frames as a dual system［J］. Engineering Structures, 2006, 28(11): 1525-1532.［4］李铭. 间隙保护屈曲约束支撑的性能和应用研究［D］. 南京: 东南大学, 2012.［5］黄波. 高性能屈曲约束支撑低周疲劳性能及抗震需求分析［D］. 南京: 东南大学, 2012.［6］CHEN Z Y, GE H B, KASAI A, et al. Simplified seismic design approach for steel portal frame piers with hysteretic dampers［J］. Earthquake Engineering & Structural Dynamics, 2007, 36(4): 541-562.［7］GB 50017—2003 钢结构设计规范［S］. 北京：中国计划出版社，2003.
