INFLUENCE OF INTERFACIAL INTERACTION TO THE STIFFNESS OF STEEL-CONCRETE COMPOSITES WITH VARIOUS BOUNDARY CONDITIONS UNDER BENDING MOMENTS

Steel-concrete composite structures under bending moments have different deformation characteristics, which leads to interfacial slip and affects the stress-strain state of the entire structure as a whole. This paper presents an analytical expression for determining the friction capacity parameter in steel-concrete composite beam structures under various boundary conditions. The interfacial shear stress and interfacial shear force plot of such structures is shown. The contribution of the interfacial effect to the overall rigidity of the composite structure is estimated. The analytical values of the deflections are compared with the values obtained experimentally. The results of comparison show that neglecting the interfacial effect in current standards and guidelines leads to incorrect assessment of structural deformability. The proposed analytical model can be used to determine the stiffness of steel-concrete composite slabs.