Flexural Capacity of Concrete Beam Reinforced with GFRP Bars

Abstract

This paper proposes an analytical study to predict the flexural capacity of structure elements reinforced with glass fibre reinforced polymer (GFRP) bars. A nonlinear stress-strain curve of concrete is employed to consider the contribution of concrete under compression. The analytical calculation is validated against a published experiment, and the results are also compared to the ACI 440.1R-15 code. The results showed that the rupture modes predicted in the analytical study were comparable to those of the experiment, and the average ratio of flexural capacity calculated using Todeschini’s nonlinear curve to the experiment ranged from 0.78 to 0.86. Furthermore, flexural capacity obtained using nonlinear stress-strain curve of Todeschini for specimens with reinforcement ratios higher than the balanced reinforcement ratio performed better than that obtained using the ACI code.

A State-of-the-Art Review on The Behavior of RC Beams with Different Types of FRP Reinforcement

“…The results showed that the predicted rupture modes by the analytical analysis matched the rupture modes seen in the experiment as recorded in Table 1. Furthermore, flexural capacity obtained using Todeschini's nonlinear curve [5] for specimens with reinforcement ratios greater than the balanced reinforcement ratio performed better than that obtained using ACI code [8] as shown in Figures 6 and 7.…”

“…El Refai et al (2015) [3] studied the structural performance of hybrid reinforced concrete beams. Three beams with only GFRP reinforcement and six other beams reinforced with a combination of GFRP and steel bars were tested to investigate the flexural performance as shown in Figure 1 Ridwan et al ( 2021) [5] proposed an analytical approach to predict the flexural capacity of a beam reinforced with GFRP bars. This approach was based on strain compatibility and internal forces equilibrium.…”

“…Table 1. Comparison of rupture mode between the experiment [6] and the analytical study [5] Figure 6. Comparison of flexural capacity ratios of Todeschini's curve to the experiment and the ACI code to the experiment for the FB specimen series (30 MPa concrete beam series) [5] Figure 7.…”

“…Comparison of rupture mode between the experiment [6] and the analytical study [5] Figure 6. Comparison of flexural capacity ratios of Todeschini's curve to the experiment and the ACI code to the experiment for the FB specimen series (30 MPa concrete beam series) [5] Figure 7. Comparison of flexural capacity ratios of Todeschini's curve to the experiment and the ACI code to the experiment for the HFB specimen series (50 MPa concrete beam series) [5]…”