纵向凹槽剪力墙水平连接构造参数研究

Research on the construction parameters of horizontal joints in longitudinal notched shear walls

研究了纵向凹槽剪力墙不同构造参数对水平连接钢筋锚固性能的影响,设计6组不同构造参数,对36个剪力墙试件进行水平连接钢筋拉拔试验。结果表明:钢筋C型开口水平分布试件均产生后浇混凝土拔出破坏,其余试件均产生水平连接钢筋断裂破坏。凹槽水平连接处布置环形箍筋、增加凹槽内竖向插筋配筋量、增加凹槽内表面粗糙面积均能使现浇混凝土破坏延后,提升对水平连接钢筋的锚固性能;对于直径为8 mm的HRB400E级水平连接钢筋,凹槽深度200 mm和150 mm均能满足锚固受力要求;凹槽深度为200 mm时,凹槽混凝土保护层厚度由15 mm增加至45 mm,纵向凹槽剪力墙对水平连接钢筋的锚固性能略微降低。

In order to study the effect of different construction parameters on the anchorage performance of horizontal connect-ing reinforcement in longitudinal notched shear walls,six groups of different variations of construction parameters were designed,and36 shear wall specimens were subjected to horizontal connecting reinforcement pullout tests.The test results show that:the C-type opening specimens with horizontally distributed reinforcement all produce post-poured concrete pullout damage,and the rest of the specimens all produce horizontal connection reinforcement fracture damage.Arrangement of ring hoop reinforcement at the horizontal connection of notch,increase the amount of longitudinal steel reinforcement,increase the roughness of the notch inner surface can delay the damage of cast-in-place concrete,and improve the anchorage performance of horizontal connection reinforcement.For the horizontal connection reinforcement of HRB400E grade of 8 mm in diameter,the depth of notch of 200 mm and 150 mm can satisfy the anchorage requirements;When the depth of notch is 200 mm,the thickness of protective layer of notch concrete is increased from 15 mm to 45mm,and the anchorage performance of longitudinal notched shear wall for horizontal connecting reinforcement is slightly reduced.