Numerical and Experimental Study On Pull-out Behaviour of Stud Shear Connector Embedded in Concrete

In steel-concrete composite beams, stud shear connectors are commonly used to transfer the longitudinal shear force across the steel flange/concrete slab interface. In some structures, however, headed studs could be subjected to huge tensile loading during life-span of structures. In this paper, the pull-out behaviour of stud shear connector is studied using both experimental and numerical methods. In experimental study, a standard pull-out test procedure was proposed and twelve full-scale specimens were manufactured and tested to determine pull-out load-displacement curves. Depending on the stud heights, all specimens were divided into four groups with 3 specimens in each group. In each group, two specimens were carried out under a monotonic loading and one was conducted subjected to a repeated loading pattern. Two kinds of failure mode, concrete cone failure and stud shank failure, were observed in these tests. The resulting monotonic load-displacement mechanism is studied as a 3D problem using finite element analysis software, DIANA. The FEA results are found in good agreement with the test results. All experimental and FEA results demonstrate that specimens with long headed studs have good performances of ultimate strength and ductility.