Experimental analysis explores flexural behavior of concrete slabs reinforced with GFRP bars, highlighting differences in deflection and failure modes.
This study aims to investigate the flexural behavior of simply supported one-way reinforced concrete (RC) slabs constructed with high-strength concrete (HSC) and normal-strength concrete (NSC), reinforced with either glass fiber reinforced polymer (GFRP) bars or conventional steel reinforcement. Four large-scale reinforced concrete (RC) slabs were tested under four-point bending. The failure and cracking loads, deflection, crack patterns, and failure modes were considered as main parameters. Results showed that GFRP-reinforced slabs (both NSC and HSC) had higher deflections by 2.60 times and lower ultimate loads by 21.0% to 32.0% compared to steel-reinforced slabs. GFRP-reinforced specimens also experienced sudden failure due to bar rupture and exhibited wider cracks. The experimental results compared with those from analytical predictions based on ACI 440, CAN/CSA S806, and Eurocode 2, the results were in accordance. While CSA S806-12 slightly underestimated cracking loads for HSC-GFRP slabs, it provided accurate mid-span deflection estimates. Eurocode 2 predictions for crack widths were within 10% of the values observed.
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Altayeb et al. (2025) studied this question.
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