Design Codes on Stud Shear Connectors for New Details

Current design codes on stud shear connectors have clear limitations to cover new details of stud shear connection. New trends of stud shear connection are large diameter up to 30mm, clustered studs, different material for bearing, mixed arrangement with lying and vertical studs and confinement details. A research program was started to develop a separate design code on steel-concrete composite structures covering building and bridge structures in Korea. In order to improve current design provisions of stud shear connectors, experimental data on static and fatigue strength were collected, especially for new details. Collected data of experimental results, current design codes on static and fatigue strength of stud shear connection were investigated to expand their application limits. Additional coefficients for static strength are needed to consider new details. For the application of high strength material, shear stress range needs to be limited by 60% of static strength and bearing stress of concrete also need to be limited by 3 times of compressive strength of concrete to use current S-N curves. Shear connectors for precast decks, large studs greater than 27mm and clustered connectors with narrower stud spacing than 5 times of the diameter showed slight decrease of fatigue strength.