Research On The Construction Details Of Shear Connector Used To Connect Precast Reinforced Concrete Shear Wall Panels

Precast shear wall structure,with shear wall panel prefabricating in the factory and assembling 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 related research to this special mechanical state is necessary.Based on the related research results,considering different connection structure of horizontal interface as design parameter,several kinds of shear splicing were designed,which include: pre-stressed high-strength rebar splicing,section steel grouting anchor splicing,rebar grouting anchor splicing,a cast-in-place specimen for comparison was built to evaluate their capacity.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.The effects of related parameters on the seismic performance of the specimens,such as bearing capacity,stiffness degradation,ductility and energy dissipation were analyzed at last.The simulation results show that: the tension on the specimen has significant influence on the specimen's seismic performance;the pre-stressed force in the pre-stressed high-strength rebar splicing specimen reduces the adverse effects of tension on the concrete,the bearing capacity increases comparing to cast-in-place specimen;the section steel grouting anchor splicing specimen and rebar grouting anchor splicing specimen which can be assembled with good integrity have nearly the same seismic performance with the cast-in-place specimen.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.