摘要
为解决带传统竖向连梁的Y形偏心支撑组合框架在地震作用下组合梁跨中混凝土严重损伤的问题,设计并制作了1榀带腹板弯折连梁的Y形偏心支撑组合框架,并对该框架和拆卸失效连梁后的框架依次进行了拟静力试验。结果表明:在位移角为1/600时,连梁已经屈服耗能,直至位移角为1/60时,试件的滞回曲线饱满且稳定;之后由于连梁腹板根部和腹板中部发生撕裂破坏和面外屈曲变形;承载力迅速降低,但此时组合框架仅钢梁下翼缘发生轻微屈曲变形;拆卸失效连梁后,试件的残余位移角仅为0.002 rad,小于连梁可更换限值(0.003 rad);再加载试验发现,拆卸失效连梁后的组合框架的承载力随着变形的增大而缓慢上升,滞回曲线饱满稳定,仍具有良好的耗能能力。
To address the issue of severe concrete damage in the mid-span region of composite beam caused by traditional Y-eccentrically braced composite frame with a vertical shear link,a Y-eccentrically braced composite frame incorporating bent shear panel damper was developed in this study and tested under cyclic loading.The specimen was tested both in its original form and after disassembling the failed shear link.Results show that at a drift ratio of 1/600,the shear link has already undergone yielding and energy dissipation,while at a drift ratio of 1/60,the specimen exhibits a stable and complete hysteresis curve.Nevertheless,the structural load-bearing capacity declines significantly due to tearing failure and out-of-plane buckling deformation occurring at the root and mid-span of the shear link web.At this point,only minor buckling deformation is detected in the lower flange of the composite frame’s steel beams.Following the removal of the failed bent shear panel damper,the specimen exhibits a residual drift ratio of 0.002 rad,remaining below the replacement limit of 0.003 rad for the shear link.Subsequent loading tests demonstrate a gradual increase in the load-bearing capacity of the remaining composite frame with deformation,while the hysteresis curve remained full and stable,confirming its continued energy dissipation capability.
作者
赵永飞
樊立龙
吴桢灏
张凯
ZHAO Yongfei;FAN Lilong;WU Zhenhao;ZHANG Kai(College of Civil Engineering,Hunan University,Changsha 410082,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Tsinghua University,Beijing 100084,China;CRCC Bridge Engineering Bureau Group Co.,Ltd,Tianjin 300300,China)
出处
《建筑结构学报》
北大核心
2025年第S1期22-33,共12页
Journal of Building Structures
基金
国家自然科学基金青年科学基金项目(52208117)
关键词
Y形偏心支撑
组合框架
腹板弯折连梁
拟静力试验
受力性能
Y-eccentrical brace
composite frame
bent shear panel damper
quasi-static test
mechanical property
