Research On Horizontal Interface Of Precast Shear Wall With Bolt And Two-Side Connecting Plate

Precast shear wall structure,with shear wall panel prefabricated in the factory and assembled into a whole lateral force resisting structure by horizontal and vertical interfaces in the construction site,is one of the precast structures in the construction industrialization.The seismic performance of the interface is a key factor influencing the holistic seismic performance of precast shear wall structure.Nowadays the seismic performance research to precast shear wall structure with horizontal interface under horizontal force is quite systematic and a lot of connections were put forward,however,the research to precast shear wall structure with horizontal interface under horizontal force when the wall panels bear tension causing by horizontal force is lacking.Therefore reseach on it is of necessary.Based on the related research results,this article is proposed a new type connection of high strength bolts and steel plate connecting the prefabricated reinforced contrete shear wall.To investigate the feasibility and load-transferring mechanism of the connection,considering different pretensions of the high strength bolts as design parameter,three horizontal seam specimens are designed,and to design a cast-in-place specimen for comparison.Then,the finite element simulation is carried out by using ABAQUS.Related experiments results were used to verify the rationality of the simulation at first.And then simulations were carried out to the design specimens,to nalysis the effects of related parameters on the seismic performance of the specimens,such as bearing capacity,stiffness degradation,ductility and energy dissipation were analyzed.On the basis of the finite element analysis,the load-transferring mechanisms of the connection was analyzed.The simulation results show that: the tension on the specimen has significant influence on the specimen's seismic performance;The test results show that the integrity of the totally prefabricated shear wall is relatively good,its seismic performance is close to the cast-in-place specimen;this new connection scheme is feasible and its load-transferring path is clear,the strength of the steel connecting plate and high strength bolts.Compared to the cast-in-place specimen,when story drift angle of the specimens reached the limit of 1/120 of the shear wall structure's story drift angle in the large earthquake,the lateral stiffness decreases too much,the bearing capacity has no significant decline,which reflects the better ductility and energy dissipation capacity of the specimens.Current constitutive equations of concrete can't truly reflect the concrete's drop-off under cyclic load of tension and compression.As a result,the hysteresis curve of the simulation is quite full and the simulation results have some deviations comparing to the experiment results.But the conclusion can reflect the performance of the precast shear wall structure to some extent and can provide theoretical reference to engineering practice.In addition,it is suggested that more reasonable and simplified measures based on experiment should be put forward in order to simulate the seismic behavior of similar specimens more accurately and systematically.