Modeling the Nonlinear Behavior of Predamaged Reinforced Concrete Beams Retrofitted with Bonded and Jacketed FRP Sheets

Abstract

This paper consists on the numerical simulation based-finite element modeling carried out on reinforced concrete (RC) beams predamaged and strengthened with carbon fiber sheet (CFRP) and a fiberglass (GFRP) jacket under monotonic bending loads. The retrofitted RC beams were modeled using ABAQUS to estimate the effect of concrete and steel damage rate. After the experimental validation of the proposed model, four configurations of damage rate were considered according the initial compression resistance of undamaged concrete. Indeed, the geometrical model and the choice of the finite element models were generated in a full three-dimensional (3D) space. Moreover, the real behavior of each used material has been simulated using the experimental laws of each one, namely: concrete damaged plasticity, elastoplastic steel model with isotropic hardening and orthotropic elastic one for FRP composites. The discussion of the numerical outcomes in terms of bearing capacity curves and the tensile damages maps provides the full interest of the FRP repair technology on the overall and local flexural response of predamaged RC beams.

Keywords

• Predamaged beams
• Repair
• CFRP sheets
• GFRP Jacket
• Nonlinear FE simulation.