Structural bonding for civil engineering structures: New model of compositeI-steel-concrete beam strengthened with CFRP plate

Abstract

In this paper, a composite beam element has been developed in this study, the composite steel-concrete beam strengthened with CFRP plate element can be used to model the nonlinear behavior of composite beams. The problem of slip and interfacial stresses in composite steel-concrete beam strengthened with CFRP plate is analyzed using linear elastic theory. The analysis is based on the deformation compatibility approach, where both the shear and normal stresses are assumed to be invariant across the adhesive layer thickness. The adopted model takes into account the adherend shear deformations by assuming a linear shear stress through the depth of the composite steel-concrete beam. This solution is intended for application to beams made of all kinds of materials bonded with a thin composite plate. For composite steel-concrete beam section, a geometrical coefficient is determined to show the effect of the adherend shear deformations. The theoretical predictions are compared with other existing solutions analytical and experimental which demonstrates the accuracy of the used element. Finally, numerical comparisons between the existing solutions and the present new solution enable a clear appreciation of the effects of various parameters. This research is helpful for the understanding on mechanical behaviour of the interface and design of such structures.