Abstract:According to the characteristic that the bearing capacity of Twin-PBL shear connector can be improved by the end-bearing concrete, a new type of discontinuous U-type Twin-PBL shear connector able to be used for prefabricated steel-concrete composite structure is proposed. Through the nonlinear numerical simulation analysis of three groups of push-out test specimens, the ultimate bearing characteristics and bearing capacity of this new hear connector are studied. The results show that the ultimate bearing capacity of U-type Twin-PBL shear connector is significantly higher than that of common pressure-bearing type Twin-PBL shear connector, and the improvement mainly comes from the increase of end-bearing area of concrete. Therefore, the improvement of concrete strength has a significant influence on the bearing capacity of this shear connector. However, the contribution of concrete tenon and penetrating steel to the bearing capacity has no obvious change. Therefore, the computational formula of the bearing capacity of U-type Twin-PBL shear connector is presented by modifying the area of the end-bearing concrete.
