Local stress behavior around welded joint between angle-shape shear connector and bottom plate in steel-concrete composite slab was investigated by 3D FEA. From the analytical result, local bending deformation was observed when the bond between concrete and steel plate was lost. Also, it was confirmed that local stress around welded joint due to local bending deformation was strongly correlated with shear stress of shear connector. After these analytical investigations, correlation equation between stress concentration factor of welded joint and shear stress of angle shape shear connector was established in order to carry out fatigue design. Moreover, in this paper calculating methods of bending moment and shear stress for steel-concrete composite slab using angle shape shear connector were recommended.
