开缝钢板加固既有钢筋混凝土剪力墙抗倒塌性能试验研究  

Experimental study on collapse resistance performance of existing reinforced concrete shear wall strengthened by slotted steel plate

作　　者：程蓓 周梦杰 雷廷尉 杨参天 Cheng Bei;Zhou Mengjie;Daniel T.W.Looi;Yang Cantian(School of Civil Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;State Grid Beijing Daxing Electric Power Supply Company,Beijing 102600,China;Department of Civil Engineering,The University of Hong Kong,Hong Kong 999077,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]国网北京市电力公司大兴供电公司,北京102600 [3]香港大学土木工程系,香港999077

出　　处：《建筑结构》2019年第2期36-42,共7页Building Structure

基　　金：国家重点研发计划资助(2017YFC0703600);北京市自然科学面上基金项目(8162014);国家自然科学青年基金项目(51208023)

摘　　要：老建筑中小跨高比剪力墙的抗震能力往往不能满足当前的抗震设计要求,尤其是底部或转换层中的剪力墙,在高轴压比下容易发生脆性剪切破坏而导致整个剪力墙体系的倒塌。为了提高既有小跨高比剪力墙在地震中的抗倒塌性能,提出了一种新型的开缝钢板加固法。研究了开缝钢板加固法对钢筋混凝土剪力墙的破坏形式、滞回曲线、延性和抗倒塌性等受力性能的影响。按照高宽比1∶1的比例制作4个钢筋混凝土剪力墙试件,并对其中的1个试件使用未开缝钢板进行加固和对2个试件使用开缝数量不同的钢板进行加固。通过低周反复荷载及高轴力试验表明,未进行钢板加固的剪力墙和采用未开缝钢板加固的剪力墙均发生了倒塌破坏。而采用开缝钢板加固的剪力墙未发生倒塌破坏,并且其延性和耗能能力都有所提高。The seismic capacity of shear walls with small and medium span-to-height ratios in old buildings often fails to meet the current seismic design requirements. In particular,the shear walls in the bottom or transfer story are prone to brittle shear failure under high axial compression ratio,which leads to the collapse of the whole shear wall system. In order to improve the collapse resistance performance of existing shear walls with small span-to-height ratios in the earthquake,a new method of strengthening with slotted steel plates was proposed. The influences of slotted steel plate reinforcement on the failure modes,hysteresis curves,ductility and collapse resistance of reinforced concrete shear walls were studied. Four specimens of reinforced concrete shear wall were fabricated according to the ratio of height to width of 1: 1,and one of them was strengthened with non-slotted steel plates,and the rest two specimens were strengthened with slotted steel plates of two different slot numbers. The results of low cyclic repeated load and high axial load tests show that both shear walls without steel plate reinforcement and shear walls with non-slot steel plate reinforcement are collapsed. However,the shear wall strengthened with slotted steel plates does not collapse,and its ductility and energy dissipation capacity are improved.

关 键 词：加固 剪力墙 开缝钢板 抗倒塌性能 

分 类 号：TU375[建筑科学—结构工程]