Numerical Modelling of the Nonlinear Shear Creep Behavior of FRP-Concrete Bonded Joints Article - Janvier 2023

François Soleilhet, Marc Quiertant, Karim Benzarti

François Soleilhet, Marc Quiertant, Karim Benzarti, « Numerical Modelling of the Nonlinear Shear Creep Behavior of FRP-Concrete Bonded Joints  », Materials, janvier 2023, p. 15 p. ISSN 1996-1944

Abstract

This paper presents a numerical investigation of the shear creep behavior of the adhesive joint in concrete structures strengthened by externally bonded fibre-reinforced polymers (FRP) composites. Based on experimental data collected in a previous study, creep constitutive equations were developed for the adhesive layer and implemented into a finite element code. The proposed model extends the classical one-dimensional formulation of Burgers creep model to a fully 3D model and introduces the nonlinearity of the model parameters. This numerical approach was first used to simulate the nonlinear creep behavior of bulk epoxy samples ; it was then extended to predict the nonlinear creep response of the FRP-concrete interface in double lap shear specimens. Globally, a fair agreement was obtained between numerical results and experimental evidences. As a main result, it was found that creep induces a redistribution of the interfacial shear stress along the FRP-concrete lap joint, leading both to a stress relaxation near the loaded end of the adhesive joint and to an increase in the effective transfer length.

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