Finite Element Modelling of Shear Stud Behaviour in Composite Beams with Parallel Steel Decking

This study investigates the behaviour of shear studs in steel composite beams with parallel profiled steel decking. Using ABAQUS/Explicit, a validated 3D finite element model was applied to nine push tests, analysing factors such as stud spacing, concrete cross-sectional areas, and rib deck geometries with depths of 146 mm and 76 mm and rib deck ratios of 0.67 to 1.97. Contrary to earlier research, results reveal no clear correlation between rib deck ratio and shear connector resistance. Specimens with narrower ribs often outperformed those with wider ribs due to larger effective concrete areas above and below the decking. This highlights discrepancies in current design codes, which underestimate shear resistance in parallel decking configurations affected by stress concentrations and reduced confinement. The study underscores the need for updated design formulae and provides insights for optimising shear connector designs, enhancing structural efficiency and safety in modern composite beam construction.