The focus of this research would be how successful hybrid steel-CFRP/GFRP rebar strengthening is in enhancing the overall behaviour of reinforced concrete (RC) beams under flexure. Although it reduces the possibility of debonding through intermediate crack debonding and critical diagonal crack debonding, failure due to debonding and other causes still has an impact on the strengthening system's efficiency. Using steel as a main reinforcement or for strengthening causes corrosion, which is the chief cause of (RC) structure deterioration. The corrosion process causes severe structural damage, including longitudinal cracks in the concrete cover affected by expanded corrosion products, loss of cross-sectional area of steel bars, bond deterioration between concrete and steel bars, and a significant decrease in the maximum stress of reinforcing bars (referred to as "reduction in steel bar ductility"). As a result, the service life and ultimate capacity of (RC) constructs are considerably lowered. Unfortunately, in situations where buildings must maintain ductility, composite materials with no ductility may not be sufficient. Due to the fragile character of FRP composites, certain investigations have shown that brittle fracture processes occur in engineering structures reinforced with FRP composites. It is important to note that in most concrete constructions, the thickness of the concrete cover is insufficient to fulfil the criteria of the required groove dimensions.