带有延时保护支撑的冷弯薄壁型钢组合墙抗震性能试验研究  

An Experimental Study of Seismic Performance of Cold-formed Thin-walled Steel Shear Walls Using Delay Protection Bracing

作　　者：闫维明[1] 田宇 虞诚 谢志强 YAN Weiming;TIAN Yu;YU Cheng;XIE Zhiqiang(Key Laboratory of Earthquake Engineering and Structural Retrofit of Beijing,Beijing University of Technology,Beijing 100024,China;Department of Engineering Technology,University of North Texas,Denton 76207,USA;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124 [2]北得克萨斯大学工程技术系,登顿76207 [3]北京建筑大学土木与交通工程学院,北京100044

出　　处：《北京工业大学学报》2020年第11期1246-1255,共10页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51678008);中国博士后科学基金资助项目(2018M641167,2019T120044);北京市博士后国际交流培养资助项目(21009919001)。

摘　　要：为了解决波纹钢板覆面冷弯薄壁型钢组合墙延性低、变形能力差等问题,提出了一种带有延时保护功能的支撑装置并揭示其工作原理,考虑支撑滑动距离等因素设计了3片带有延时保护支撑组合墙及1片普通组合墙,并对其进行抗震性能试验研究.基于试验结果,揭示其破坏模式和破坏机理,分析新型组合墙的抗震性能,探明支撑滑动距离对其抗震性能的影响,进一步验证支撑工作原理.结果分析表明,新型墙体的破坏模式主要为波纹钢板的屈曲、自攻螺钉连接失效和支撑可滑动钢拉条屈服;支撑滑动距离存在较优值,安装较优滑动距离的支撑不但可有效提高墙体的延性、极限变形能力及耗能,延缓刚度退化,而且可保持其较高承载力及抗侧刚度.This paper presents a brace with function of delay protection and its working mechanism to solve the problem that cold-formed steel(CFS)shear walls with corrugated steel sheathing have low ductility and bad deformation capability.Three CFS shear walls using delay protection bracing and one regular CFS shear wall were designed by considering the effect of different sliding distances of the brace.An experimental study of seismic performance on these shear walls was conducted.The failure modes and the failure mechanism of shear walls were indicated,the influence of different sliding distances of the brace to the seismic performance of CFS shear walls was analyzed,and the working principle of the brace was verified.The test results show that the failure modes of the CFS shear wall using delay protection bracing are the buckling of the corrugated steel sheets,the failure of the screw connection between panel and boundary stud and the yield of the steel tensile strip installed in the brace.The sliding distance of the brace has an optimal value.The ductility,ultimate deformation capacity and energy dissipation of CFS shear walls can be improved by installing the brace of delay protection with optimal sliding distance.It can also decrease the speed of stiffness degradation and make the shear walls keep high strength and lateral stiffness.

关 键 词：延时保护支撑 波纹钢板 冷弯薄壁型钢组合墙 抗震性能 支撑滑动距离 

分 类 号：TU392.5[建筑科学—结构工程] TU317.1