Numerical analysis and force transfer mechanism of PBL connector in steel-UHPC structure

Finite element analysis is used to study the numerical analysis and force transfer mechanism of PBL connectors in steel-UHPC structure. Based on the calculated test results, the finite element model is built, the whole process of connector force is analyzed and the parameters are analyzed. After the test verification, the load-slip curve and the test curve are relatively high, and the peak load ratio is between 0.96 and 0.98, with an error of <10%, which can accurately predict the bearing capacity and stress state of the PBL connector. Force transmission mechanism: in the elastic stage, the shear force is shared by the concrete tenon and the steel bar, and the concrete proportion is high; in the elastic-plastic stage, the concrete tenon is gradually plastic, and the load proportion of the steel bar increases; during the limit damage, the concrete tenon damage is obvious, and the steel bar yields, and the test piece loses the bearing capacity. The shear resistance of penetrating reinforcement and concrete tenon are the key to determine the shear bearing capacity of PBL connector. Reasonable selection of UHPC compressive strength, opening steel plate thickness, through the reinforcement yield strength and opening diameter, can effectively improve the mechanical properties of PBL connector. This study provides theoretical support for the design and optimization of PBL connector in the steel-UHPC combination structure.