Modeling the bond of GFRP and concrete based on a damage evolution approach

The effect of debonding of glass-fiber-reinforced-polymer (GFRP) reinforcing bar on progressive collapse resistance of concrete structures is an important point in the design of GFRP reinforced concrete structures. Due to the complexity of the GFRP-concrete debonding failure, numerical analyses are necessary to better understand the influence of several parameters on this failure mode. Hence, the current paper aims to develop a 3D finite-element (FE) model, capable of predicting the debonding failure by modeling the GFRP bar-concrete bond interface using cohesive elements. The damage assessment approach is adopted to determine the properties of the bond interface. Moreover, the model considers the nonlinear behavior of concrete. At the end, the good predictive performance of the developed FE model is demonstrated by comparing with the relevant experimental results.