INTERFACIAL STRAIN ENERGY RELEASE RATE OF FIBER REINFORCED CONCRETE BASED ON BOND STRESS-SLIP RELATIONSHIP

An analytical model is developed to predict the ultimate tensile strength of fiber reinforced concrete when the failure is governed by fiber debonding, and to account for the interfacial slip between the concrete and the fiber. The analysis is based on the priciple of the compliance method in fracture mechanics with the presence of a traction-free interfacial crack between the fiber and the concrete. It is shown that the pullout strain energy release rate for fiber reinforced concrete can be obtained for cases with and without the existence of an interfacial crack. Numerical examples are presented and compared to results obtained in the literature by using finite element analyses and experimental tests. The comparison demonstrates the accuracy and the convergence of the model.