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

François Soleilhet (1) , Marc Quiertant (2, 3) , Karim Benzarti (4, 2)

1 EDF Labs
2 Université Gustave Eiffel
3 MAST-EMGCU - Expérimentation et modélisation pour le génie civil et urbain
4 NAVIER UMR 8205 - Laboratoire Navier

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.

Keywords: epoxy adhesive FRP-concrete bonded joints nonlinear creep finite element modelling; epoxy adhesive; FRP-concrete bonded joints; nonlinear creep; finite element modelling

Domains: Engineering Sciences [physics]

François Soleilhet, Marc Quiertant, Karim Benzarti. Numerical Modelling of the Nonlinear Shear Creep Behavior of FRP-Concrete Bonded Joints. Materials, 2023, 16 (2), 15 p. ⟨10.3390/ma16020801⟩. ⟨hal-03939124⟩