Experimental Study On The Effect Of Joint Treatment On The Seismic Performance Of Prefabricated Shear Wall With Composite Alveolar

Precast concrete shear wall structure has become one of the main structural forms of multi-storey buildings because of its advantages including high construction speed and good seismic performance.Achieving the reliable connection between the upper and lower walls and avoiding the damage easily appeared in the weak position are both the key to ensure that the precast concrete shear wall has good seismic performance and overall performance.In this paper,based on the experimental study of prefabricated shear wall by the research group,different treatment methods were adopted at the horizontal joint of prefabricated shear wall to study the effect of different treatment methods on the seismic performance of the prefabricated shear wall with cogged connection.The test and design basis were provided to solve the problem that the cracks are concentrated at the joint of new and old concrete and the wall panels between upper and lower are prone to be staggered.The main work is as follow:1)Three full-scale composite cogging connecting to precast concrete shear walls are designed and manufactured.Three treatment methods were adopted at the horizontal joint,including common chiseling,adding shear key of section steel and increasing the diameter of reinforcement passing through the joint.The test results show that the failure modes of all specimens are compression yield or tension of the longitudinal bars of the concealed columns on both sides of the prefabricated wall and bending failure of the concrete on both sides of the wall.The displacement ductility coefficient of the prefabricated specimens is greater than 4;the ultimate displacement angle ranges from 1/ 42 to 1/ 51,and the deformation capacity of the wall is good.The connection and anchorage of the steel bars at the cogging of the specimens are reliable,which can effectively transfer the stress of the steel bars.Adding shear key of section steel and increasing the diameter of steel bar passing through the join would make the hysteretic curve more fuller and make contribute to the bearing capacity,energy consumption capacity,initial stiffness and the seismic performance.2)The finite element software ABAQUS was used to build the structure model and analyze the numerical value of the prefabricated specimen.Through the comparison between the simulation results and the test results,it can be seen that the finite element simulation results are basically consistent with the test results.On this basis,the numerical simulation analysis of the variable parameters such as the axial compression ratio and the diameter of U-shaped steel bar is carried out.The results show that the increase of the axial compression ratio and the diameter of U-shaped steel bar can improve the bearing capacity and rigidity of the specimens.