Analytical study on increasing slip strength of high-strength threaded stud-welded frictional joint with inorganic zinc-rich painted surface for a thin steel plate

The authors are studying a steel concrete composite slab joint structure improving workability by applying high strength stud bolts. The bottom steel plate is 6mm steel plate, which limits the axial force that can be introduced by the stud bolts to about half that of high-strength bolts. Consequently, compared to the high-strength bolt friction joint, the number of bolts increase, potentially affecting bolt placement and construction. We focused on the tendency of friction coefficient to increase with decreasing contact pressure when the joint surface treatment is inorganic zinc. In this study, FEM was conducted to increase the slip load by cutting around the bolt hole wall on the top side of the splice plate. The results have been shown that the contact area increased and the contact pressure decreased as the splice plate cloud follow the deformation of the main plate. It is also concluded that the cutting the edge of the bolt hole wall of the splice plate improved slip load.