PBL抗剪连接件受力性能分析OA

[Objective]PBL shear connectors,as key connecting components in steel-concrete composite structures,have attracted widespread attention from researchers due to their excellent mechanical properties and broad application prospects.This study integrates experimental and numerical analyses to examine the effects of various design parameters on the load-bearing capacity,shear stiffness,and slip performance of PBL shear connectors.Additionally,their mechanical behavior and variation patterns of key performance indicators are investigated.[Methods]Five different types of shear connectors were designed for the experiment.Numerical calculations were first performed on all models using ABAQUS finite element analysis software,and the results were used as the basis for experimental loading.[Results]The results showed that the load-bearing capacity of PBL connectors was significantly affected by factors such as the hole diameter of the steel plate,the diameter of the transverse rebar,and concrete strength.Furthermore,the material properties of concrete had a significant effect on the shear stiffness of the connectors.As the hole diameter of the steel plate and the diameter of the transverse rebar increased,both the load-bearing capacity and slip performance of the connectors increased.Further experiments showed that PBL connectors exhibited favorable performance during the elastic and plastic stages of the load-slip curve.Among the different hole-type connectors,the Type D specimens exhibited strong elastic and elastoplastic performance but had poor ductility,while the failure mechanism of the Type E trapezoidal-hole connectors differed significantly from that of the circular-hole connectors.Additionally,tensile and compressive stresses significantly affected the connector performance,and applying compressive stress significantly improved their ultimate load-bearing capacity and plastic performance.[Conclusion]This study provides valuable theoretical support for the design optimization of PBL shear connectors and can effectively improve the performance and safety of steel-concrete composite structure bridges.