Calculation method of flexural capacity of GFRP-reinforced concrete beam

Based on the test results of 62 concrete beams reinforced with GFRP (glass fiber reinforced polymer) bars and steel bars, the objective of this paper is to analyze the influence of reinforcement ratio on cracking and ultimate moment capacity.It is found out that the effect of reinforcement ratio on caraking moment capacity is not significant, but the ultimate capacity of the GFRP over\|reinforced concrete beams increases with the increase of the reinforcement ratio when the longitudinal reinforcement ratio ranging from balanced reinforcement ratio to limit reinforcement ratio. The corresponding formulas are recommended to calculate the craking moment and ultimate moment capacity of beams.