Study of slip and deflection of composite beams considering redistribution of longitudinal shear force

For the plastic deformation of flexible connectors such as studs under the lager loads, the longitudinal shear force on the interface of steel-concrete composite beams may redistribute along the full-range analysis. Heretofore, the effect of shear force redistribution is neglected mostly in studies calculating slip and deflection of composite beams. Subjected to the simply supported steel-concrete composite beams under uniform distribution load, the effects of slip and longitudinal shear-force redistribution are studied, and the mechanics full-range of the interface is divided into three work-stages. Based on the equations of axial force and curvature, the formulae for calculating slip and deflection of composite beams are presented at different work-stage. The results obtained from these formulae are compared with those calculated by the reduced rigidity method suggested in the code of steel structures of P. R. China. It is shown that the effect of longitudinal shear force redistribution must be taken into account in calculating slip and deflection of composite beams at different work-stage.