Bond between steel fiber-reinforced concrete (SFRC) jackets and concrete beams plays an important role in controlling the structural performance of strengthened reinforced concrete (RC) structures. The main objective of this study as part of the research is to create and execute a detailed three dimensional (3D) finite element (FE) model to evaluate the structural performance of RC beams strengthened with SFRC jackets. In the proposal model, both material and geometric nonlinearity were taken into consideration throw choosing appropriate model. After that, the numerical FE simulations were compared with experimental tests of other investigators on specimen strengthened with SFRC jackets. On overall, the predicted FE peak loads, mid-span deflection, longitudinal steel strain, pattern of cracks and mode of failure responses agreed quite well with the corresponding measured experimental tested data at all stages of loading. The numerical results showed that the performance of beams strengthened with SFRC jackets is dependent on bond conditions between beams and the surrounding jackets. Therefore, the developed FE model is suitable as a practical and economical tool for accurate modeling and analysis of strengthening of RC beams with SFRC jackets.