（1 河北工业大学土木与交通学院， 天津 300130；  2 河北省土木工程技术研究中心， 天津 300401； 3 河北工业大学建筑与艺术学院， 天津 300130）

［摘要］对两榀有无人字形防屈曲约束支撑的异形柱框架进行拟静力试验，研究防屈曲约束支撑异形柱框架结构的破坏形态、滞回特性、承载能力、延性性能、耗能能力等抗震性能指标。结果表明：人字形防屈曲约束支撑异形柱框架的滞回曲线呈现梭形，无撑异形柱框架的滞回曲线有明显捏拢现象，人字形防屈曲约束支撑可以使框架各层延性系数分布更加合理；有撑框架与无撑框架结构相比，有撑框架初始整体刚度提高了53-49%，极限荷载提高了1-50倍，整体极限位移角增大了近3倍。防屈曲约束支撑推迟了梁柱节点塑性铰的产生时间，改变了异形柱框架的屈服机制，使结构发生两阶段屈服，基于此提出了以人字形防屈曲约束支撑达到屈服时作为有撑异形柱框架结构的屈服点，以期更好地反映结构的抗震性能，更符合有撑框架的实际屈服机制。防屈曲约束支撑使异形柱框架结构累积损伤程度减轻，屈服阶段至破坏前，组合结构黏滞阻尼系数基本稳定在0-21左右，没有出现大幅度降低。

［关键词］防屈曲约束支撑； 异形柱框架结构； 抗震性能； 往复荷载； 屈服机制

中图分类号：TU375文献标识码：A文章编号：1002-848X(2019)16-0112-08

Experimental research of BRBs′ enhancement effect on seismic performance of special-shaped column  frame structure

Qiao Jinli1,2, Ding Dong1, Ren Zemin3, Wang Xiaowei1, Meng Qiujie1, Ling Xiaoxiao1

(1 School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300130, China;2 Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401, China;3 School of Architecture and Art, Hebei University of Technology, Tianjin 300130, China)

Abstract:Quasi-static tests were carried out on two special-shaped column frames with unmanned herringbone buckling-restrained braces to study the failure modes, hysteretic characteristics, bearing capacity, ductility and energy dissipation capacity of the special-shaped column frame structures with buckling-restrained braces. The results show that the hysteretic curves of herringbone buckling-restrained braced special-shaped column frames are shuttle-shaped, and the hysteretic curves of non-braced special-shaped column frames are obviously pinched. Herringbone buckling-restrained braces can make the distribution of ductility coefficients of each story more reasonable. Compared with braced frames, the initial overall stiffness of braced frames increases 53-49% and the ultimate load increases 1-50 times, and the overall ultimate displacement angle increases nearly three times. Buckling-restrained braces delay the generation of plastic hinges in beam-column joints, change the yield mechanism of special-shaped column frames, and cause two-stage yielding of structures. Based on this, a new method was proposed that the yielding point of braced special-shaped column frame structures was the herringbone buckling-restrained brace′s yielding point, in order to better reflect the seismic performance of the structures and more in line with the actual yielding mechanism of braced frames. Buckling-restrained braces reduced the cumulative damage of special-shaped column frame structures. From yield stage to failure stage, the viscous damping coefficient of composite structures was basically stable at about 0-21, and there was no significant reduction.

Keywords:buckling-restrained brace(BRB); special-shaped column frame structure; seismic performance; cyclic loading; yield mechanism

*河北省高等学校科学技术研究项目（QN2014119），河北省自然科学基金（E2014202178）。

作者简介：乔金丽，博士，副教授，硕士生导师，Email:qiaojinli@126.com。