（北京工业大学建工学院  北京 100022）

［提要］  介绍了防屈曲支撑力学参数非对称现象，研究了考虑这种力学参数非对称性的恢复力滞回模型，推导了基于两种抗震设防概念的有效阻尼比的计算公式，以及基于位移的有效阻尼比的计算公式。适用于用等效静力法及弹塑性静力分析法进行抗震设计。研究了提高结构有效阻尼比的因素以及在结构抗震减震设计中应注意的问题。就结构抗震减震设计、质量管理提出了建议。

［关键词］  防屈曲支撑  有效阻尼比  消能减震  抗震设计  力学非对称性

Study on Effective Damping Ratio of Buckling-restrained Brace with Asymmetrically Mechanical Properties/Authors:Gao Xiangyu, Li Yongmei, Zhang Hui, Du Haiyan, Liang Feng(College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China)

Abstract:The usually existed asymmetrical mechanical properties of buckling-restrained brace is introduced and studied. A hysteric resisting force displacement model with considering the asymmetry is developed. The calculation formulas to effective damping ratio suitable for two kinds of seismic reduction considerations, as well as displacement based calculation formulas are studied. Some relative design conceptions to make good use of the braces are discussed and suggested.

Keywords:buckling-restrained brace；effective damping ratio；energy dissipation； seismic mitigation；seismic design

*北京市自然科学基金资助项目（8062009）；国家自然科学基金资助项目（50678013）。