Validating the predicted axial strength of FRP-reinforced concrete circular columns

Researchers have spent three decades developing Fiber Reinforced Polymer (FRP) bars as a solution for the problems caused by the corrosion in steel reinforcing bars embedded in components of reinforced concrete structures. This research aimed to establish the most ideal allowable axial compression load for concrete columns that had been reinforced with FRP using the data from previous studies. This article compares and explains the contrasts of several of the most popular FRP codes (ACI, CSA, and JSCE) with one equation proposed in previous research using empirical information gleaned from the literature review. The statistical analysis of the models is based on a comparison of theoretical and practical loads, Young's modulus, concrete strength, longitudinal reinforcement ratio, and transverse reinforcement ratio for both types of hoops and spirals. Estimating the effect of FRP longitudinal bars on the applied load carried by fiber-reinforced concrete columns can be done with the help of the empirical equation that uses the compressive strength of concrete for the estimation of the axial stress of FRP longitudinal bars in concrete columns. Results from both the CSA and the ACI were almost similar, and both were superior to those from the JSCE in terms of being ideal, consistent, and safe. Results for modulus of elasticity, concrete compressive strength, and transverse reinforcement ratio for spiral reinforcement were more stable according to the CSA, while results for longitudinal and transverse reinforcement ratios of hoop reinforcement were more stable and secure according to the ACI. Lastly, the previously proposed equation is the best way to determine the transverse reinforcement ratio for hoop reinforcement and compressive strength of concrete from all codes. In conclusion, the equation that was proposed previously is the most effective method for calculating the transverse reinforcement ratio for hoop reinforcement besides the compressive strength.