Study On Indirect Lap Splice Behavior Of Vertical Distribution Reinforcements In Sandwich Composite Shear Wall

In this paper,in order to study the reliability of the indirect lap splice of vertical distribution reinforcements in sandwich composite shear wall,60 uniaxial tension tests were completed.Pseudo-static tests were completed on two sandwich composite shear wall and a cast-in-place shear wall.The finite element simulation analysis of the shear wall in the experiment was completed,and the shear wall model with axial compression was established and the extended analysis was carried out for the inserted reinforcement rows,inserted reinforcement structure and edge members.The conclusions are as follows:(1)The bearing capacity and failure mode of the sandwich composite shear wall and the cast-in-place shear wall are basically the same.The influence of the form of the sandwich insulation connection on the indirect lap force transmission performance is negligible.(2)For the case that the lap length is sufficient and the bars break,the strength of concrete has no effect on the indirect lap performance,for the case that the lap length is insufficient,increasing the strength of concrete can increase the capacity of the indirect lap.(3)In the pseudo-static test,the failure mode of all the three walls is the inserted bars breaking,the hysteresis curve and the skeleton curve are basically the same.The bearing capacity,the stiffness after cracking and the deformation capacity are basically the same.(4)The results of the finite element analysis of the shear wall model are in good agreement with the test results.Single-row or double-row inserted bars has no obvious difference in the deformation capacity and failure form of the shear wall.Hooked inserted bars will reduce the shear force slightly.As the diameter of the inserted bars increases,the bearing capacity of the shear wall increases slightly.(5)The indirect lap length designed to be 1.2 times of the anchor length makes the indirect lap effective.