Techno Press
Techno Press

Steel and Composite Structures   Volume 26, Number 3, February10 2018, pages 347-360
The effects of different FRP/concrete bond–slip laws on the 3D nonlinear FE modeling of retrofitted RC beams — A sensitivity analysis
M. Lezgy-Nazargah, M. Dezhangah and M. Sepehrinia

Abstract     [Full Text]
    The aim of this paper is to evaluate the accuracy and reliability of the available bond.slip laws which are being used for the numerical modeling of Fiber Reinforced Polymer (FRP)/concrete interfaces. For this purpose, a set of Reinforced Concrete (RC) beams retrofitted with external FRP were modeled using the 3D nonlinear Finite Element (FE) approach. All considered RC beams have been previously tested and the corresponding experimental data are available in the literature. The failure modes of these beams are concrete crushing, steel yielding and FRP debonding. Through comparison of the numerical and experimental results, the effectiveness of each FRP/concrete bond.slip model for the prediction of the structural behavior of externally retrofitted RC beams is assessed. The sensitivity of the numerical results against different modeling considerations of the concrete constitutive behavior and bond-slip laws has also been evaluated. The results show that the maximum allowable stress of FRP/concrete interface has an important role in the accurate prediction of the FRP debonding failure.
Key Words
    debonding; FRP; bond-slip law; finite element; RC beam
Department of Civil Engineering, Hakim Sabzevari University, Sabzevar 9617976487-397, Iran.

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