Etude et analyse des différents types de renforcement dans les poutres-ponts

Abstract

The intensity of the development of reinforced concrete led to a great development of concrete structures since the first half of the twentieth century, these structures have been designed to satisfy the dimensional and mechanical performance, structural beams has sustained to a disorders due to intensive use or expiration of their service life, requires of ensuring better rehabilitation (full or partial reinforcement) to improve the mechanical performance and its durability. Repair techniques and reinforcement composite materials are characterized by their implementation simplicity and efficiency, the application of these materials for building structures is recent, and several studies have been conducted on the behavior elements reinforced by these composites. In this scientific work, an improved analytical solution for adhesive stresses in a concrete beam bonded with the FRP plate is developed by including the effect of the adherend shear deformations. 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 shear stress distribution is supposed to be parabolic across the depth of the adherends in computing the adhesive shear stress and Timoshenko’s beam theory is employed in predicting adhesive normal stress to consider the shear deformation. Numerical results from the present analysis are presented both to demonstrate the advantages of the present solution over existing ones and to illustrate the main characteristics of adhesive stress distributions.