Title: Finite Element Analysis of the Interface between FRP and Concrete

Author(s): Todor Zhelyazov, Eythor Rafn Thorhallsson, Jonas Thor Snaebjornsson

Publication: Symposium Paper

Volume: 360

Issue:

Appears on pages(s): 791-803

Keywords: concrete, constitutive relations, damage, debonding, finite element modeling, Fiber-reinforced polymer (FRP)

DOI: 10.14359/51740663

Date: 3/1/2024

Abstract:
The study delves into modeling the interface between Fiber-Reinforced Polymer (FRP) and concrete, with a specific emphasis on simulating the gradual deterioration of bond strength. A model rooted in continuum damage mechanics is integrated with an empirically derived relationship to address interfacial shear failure. Material models are defined for the concrete, the externally bonded FRP reinforcement, and the adhesive layer. These material models are implemented in finite element simulations, replicating experimental setups widely used to investigate the FRP-concrete interface. Key results are reported and discussed. More precisely, the numerically obtained load-slip relationships for the interface and visualizations of the damaged zones in concrete are provided. The numerical results are in close agreement with existing experimental data. The finite element analyses suggest that concrete degradation is not limited to the areas near the adhesive joint. This implies that the adhesive joint could influence the overall behavior of the structural elements, even when debonding failures are prevented by anchorage devices.