不同竖向接缝干式连接的全装配式复合墙体抗震性能试验研究

Experimental study on seismic performance of fully assembled composite walls with vertical joints using different dry connections

为探索更加高效、合理的墙体连接方式,设计3榀竖向接缝分别采用螺栓连接、盒式连接和U形钢板连接等干式连接,水平接缝均采用M16高强螺栓连接的一字型全装配式复合墙体试件以及1榀无竖向接缝装配式复合墙体试件,通过低周往复加载试验,对比研究不同竖向接缝连接方式全装配式复合墙体试件的破坏形态、破坏过程、滞回特性、位移延性系数、刚度退化、耗能能力以及竖向接缝的相对变形等性能。结果表明:3种竖向接缝的连接件均未破坏,符合"强节点、弱构件"的抗震设计理念,各复合墙体试件破坏过程基本相同,破坏形态均为剪切破坏,极限位移角均大于1/55,位移延性系数大于4.1。对于3种竖向接缝连接试件,采用螺栓连接的全装配式复合墙体试件承载力最大,变形能力、初始刚度和累积耗能能力居中,破坏时竖缝预埋件与周边混凝土截面部分开裂,竖缝损伤不严重;采用盒式连接的试件初始刚度最大,承载力居中但变形能力最小,累积耗能能力最弱,破坏时竖缝连接件周边混凝土破碎严重;而采用U形钢板连接的试件承载力与初始刚度最小,但其变形能力最好、累积滞回耗能能力最佳,破坏时U形钢板底部发生轻微塑性变形,竖缝连接件周边混凝土损伤最小。

In order to explore a more efficient and reasonable wall connection method,three fully assembled composite walls with dry connections for vertical joints,using bolt connection,box connection and U-shaped steel connection respectively,and a fully assembled composite wall without vertical joints were designed.The horizontal joints of all specimens are connected by bolts.Through the low cyclic loading test,the failure mode,failure process,hysteretic characteristics,displacement ductility coefficient and rigidity degradation,energy dissipation capacity and relative deformation of vertical joints of fully assembled composite walls with different vertical joints were compared and studied.The results show that the three types of vertical joints are not damaged,which conforms to the seismic design concept of"strong joint and weak component".The failure process of each specimen is basically in the same,and the failure mode is shear failure.The ultimate displacement angle of each specimen is greater than 1/55,and the ductility coefficient is greater than 4.1.The bearing capacity of bolt connection test piece is the largest,and the deformations capacity,initial stiffness and cumulative energy consumption capacity are in the midist of all specimens.When it is damaged,the embedded part of the vertical joint and the surrounding concrete section cracks,and the damage of the vertical joint is not serious.The initial stiffness of the box connection is the largest,the bearing capacity is in the midist of all specimens but the deformation capacity is the smallest,the cumulative energy consumption capacity is the weakest,and the concrete around the vertical joint connection is seriously broken when it is damaged.However,the bearing capacity and initial stiffness of the U-shaped steel plate connection specimens are the smallest,but its deformation capacity is the best,so its cumulative hysteretic energy dissipation capacity is the best.When the U-shaped steel plate is damaged,slight plastic deformation occurs at the bottom,and the concrete damage around the vertical joint connection specimens is the smallest.