双屈服点屈曲约束支撑-钢框架结构抗震性能研究  

Investigation on the seismic performance of double-stage yield buckling restrained brace-steel frame structures

作　　者：閤东东 安楠[1] 刘谦敏 苗启松 陈曦[2] 钱永熹[1] GE Dongdong;AN Nan;LIU Qianmin;MIAO Qisong;CHEN Xi;QIAN Yongxi(School of Civil and Transportation Engineering,Beijing University of Engineering and Architecture,Beijing 100044,China;Beijing Institute of Architectural Design Co.,Ltd.,Beijing 100045,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京市建筑设计研究院有限公司,北京100045

出　　处：《地震工程与工程振动》2023年第2期146-154,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51808029);北京建筑大学研究生创新项目(PG2022040)。

摘　　要：针对传统钢框架-屈曲约束支撑结构的薄弱层控制难题,本研究提出了一种面向结构最大层间变形控制和薄弱层控制双重需求的并联式双屈服点屈曲约束支撑。相比于已有双屈服点屈曲约束支撑,具有刚度和耗能能力利用率高的优点。基于某钢框架-支撑原型结构,设计了2个传统屈曲约束支撑案例和3个新型双屈服点屈曲约束支撑案例,通过对比各案例的关键地震响应,明确了新型支撑的结构最大变形控制效果和薄弱层控制效果。结果表明:罕遇地震作用下,相比于屈曲约束支撑,新型支撑的最大层间位移角峰值可降低6.2%~21.6%;表征薄弱层损伤集中程度的层间位移角集中系数分别由1.54和1.51最低降至1.29,绝大部分楼层具有了相近的位移角,且小于屈曲约束支撑结构,表明新型支撑引导了薄弱层的迁移,显著减轻了结构变形损伤集中问题。本研究的相关成果可为钢框架-支撑结构的地震响应控制提供参考。To control the weak story of steel frame-buckling restrained brace(BRB)structure,a parallel double-stage yield buckling restrained brace(DYBRB)was proposed,aiming to realize the dual control of maximum inter-story drift ratio and weak story of such structure.In comparison with the existing DYBRB,it offers the advantage of high utilization of stiffness and energy dissipation capacity.Based on a real engineering practice of steel frame-brace structure,two study cases using conventional BRB and three study cases using this new DYBRB were designed.Through the comparison of critical seismic responses of these cases,the control effects of maximum structural deformation and weak story leading by the DYBRB were identified.The results indicated that the maximum inter-story drift ratios of the cases with DYBRB could be reduced by 6.2%~21.6%in comparison with those of the cases with BRB under the maximum considered earthquake.The drift concentration factor(DCF),which characterizes the degree of damage concentration of the structure,was reduced from 1.54 and 1.51 to the minimum of 1.29.Most stories exhibited approximately identical inter-story drift ratios and were smaller than the inter-story drift ratios of the cases with BRB,indicating that the DYBRB successfully guided the migration of weak story and significantly alleviated the structural deformation damage concentration.The outcome of this study can provide references for the seismic response control of steel frame-brace structures.

关 键 词：双屈服点屈曲约束支撑 最大层间位移角控制 薄弱层控制 钢框架-支撑结构 

分 类 号：TU973[建筑科学—结构工程]