Push-out tests on stud shear connectors with constrained structure of steel-concrete composite beams

The stud shear connector is the main force transfer member in the steel-concrete composite member, and the mechanical behavior is very complicated in the concrete. The concrete around the stud is subjected to the pry-out local pressure concentration of the stud, which can easily produce splitting mirco-cracks. In order to solve the problem of pry-out local splitting of stud shear connector, a kind of stud shear connector with constraint measure is proposed in this paper. Through the push-out test, the interface shear behavior of the new stud shear connector between steel and concrete flange plate was studied, and the difference between the new stud shear connector and the traditional stud connector was compared. The results show that the stud shear connector with constraint measure can effectively avoid the adverse effect of local pressure splitting by relying on its own constraint measure. The shear stiffness of the interface between steel and concrete flange plates is greatly improved, which provides a theoretical basis for the design of strong connection coefficient of steel-concrete composite structures.

Automated summary

A stud shear connector with constraint measure is proposed in this paper to solve the problem of pry-out local splitting. The interface shear behavior of the new connector is studied through push-out test, and it is compared with the traditional stud connector. The results show that the stud shear connector with constraint measure can effectively avoid the adverse effect of local pressure splitting and improve the shear stiffness between steel and concrete flange plates, providing a theoretical basis for the design of strong connection coefficient of steel-concrete composite structures.