螺栓连接装配式多层剪力墙抗震性能试验研究

Experimental study on seismic performance of precast low-rise concrete shear wall with bolt connection

提出了一种应用于装配式多层剪力墙结构水平接缝与竖向接缝的螺栓连接节点。设计了4个分别带有竖向与水平接缝连接节点的装配式多层剪力墙试件,为了其结构性能,试件的配筋率有所放松且未设置边缘构件。通过进行抗震性能试验,得到了螺栓连接装配式多层剪力墙构件的破坏模式,分析了其受力机理。研究结果表明,螺栓连接装配式多层剪力墙受力特点与装配整体式剪力墙区别较大。装配式多层剪力墙试件破坏模式为水平接缝的弯曲破坏,初始刚度、承载力和延性可以满足多层结构的能力需求,但应分别验算构件和水平接缝的承载力;所有试件水平接缝未发生剪切破坏,带有竖向接缝剪力墙的竖向接缝在层间位移角超过1/300后出现显著滑移,各预制部分逐渐独立受力,超过1/167后完全失效。建议螺栓连接的装配式多层剪力墙在进行结构分析时,在小震作用下采用整体墙肢模型,在中震和大震作用下采用独立墙肢模型。

A bolt-connection applied to the vertical and horizontal joints'connection was proposed for low-rise concrete shear wall structure.4 bolt-connected precast low-rise shear wall specimens with vertical and horizontal joint were designed.In order to explorer the structural performance of precast low-rise shear wall,reinforcement ratio was reduced and confined boundary element was cancelled.Seismic test was carried out,the failure mode of the precast low-rise shear wall specimen was obtained and the force mechanism was analyzed.The research results show that the force characteristics of the precast low-rise shear wall structure are quite different from those of monolithic precast shear wall structure.The failure mode of the precast low-rise shear wall specimen is the flexural failure of the horizontal joint.The initial stiffness,bearing capacity and ductility can satisfy the structural requirements of low-rise buildings,but the bearing capacity of the component and the horizontal joint should be checked separately.The horizontal joints of all specimens kept in service under shear force,and the vertical joints of shear walls with vertical joints show significant slippage when the drift angle exceeded 1/300.Each precast part is gradually independent,and vertical joint completely fails after 1/167.It is suggested that in the structural analysis of the bolt-connected precast low-rise shear wall,the integral wall model should be adopted under frequent earthquakes,and the independent wall model should be adopted under middle earthquake and rare earthquakes.