The ultimate shear capacity of longitudinally stiffened steel-concrete composite plate girders

This paper presents the ultimate shear strength of longitudinally stiffened steel-concrete composite plate girders (LS-CPGs) under shear loading. The tension field action in the girder web, shear capacity of concrete slab, and the position of longitudinal stiffeners are considered in driving an analytical method to predict the ultimate shear strength of the girder. The accuracy of the proposed method is evaluated by finite-element (FE) models. A three-dimensional FE model has been generated, considering both the geometric and material nonlinearity of LS-CPGs. The results show that longitudinal stiffeners increase the ultimate shear strength of LS-CPG. The comparison between the analytical and corresponding FE results shows that the proposed analytical method can accurately predict the ultimate shear strength of LS-CPGs. [Display omitted] •Analytical approach was proposed to predict the ultimate shear strength of LS-CPG.•The approach considers three failure modes according to the configuration of LSs.•A 3D model was also generated, considering the geometric and material nonlinearity.•The accuracy of the proposed method was proved by using finite-element analyses.•LSs increased the initial stiffness and ultimate shear strength of un-stiffened CPG.