Flexural Behavior of Two-Span Continuous CFRP RC Beams
This paper investigates the feasibility of replacing steel bars with carbon-fiber-reinforced polymer (CFRP) bars in continuous reinforced concrete (RC) beams. A numerical model is introduced. Model predictions are compared with the experimental results that are available in the literature. A compreh...
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| Auteurs principaux: | , , , |
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| Format: | article |
| Langue: | EN |
| Publié: |
MDPI AG
2021
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| Sujets: | |
| Accès en ligne: | https://doaj.org/article/acd1cf7b96514049950145ecd1f37b7c |
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| Résumé: | This paper investigates the feasibility of replacing steel bars with carbon-fiber-reinforced polymer (CFRP) bars in continuous reinforced concrete (RC) beams. A numerical model is introduced. Model predictions are compared with the experimental results that are available in the literature. A comprehensive numerical investigation is then performed on two-span CFRP/steel RC beams with <i>ρ<sub>b</sub></i><sub>2</sub> = 0.61–3.03% and <i>ρ<sub>b</sub></i><sub>1</sub>/<i>ρ<sub>b</sub></i><sub>2</sub> = 1.5, where <i>ρ<sub>b</sub></i><sub>1</sub> and <i>ρ<sub>b</sub></i><sub>2</sub> are tensile bar ratios (ratios of tensile bar area to effective cross-sectional area of beams) over positive and negative moment regions, respectively. The study shows that replacing steel bars with CFRP bars greatly improves the crack mode at a low bar ratio. The ultimate load of CFRP RC beams is 89% higher at <i>ρ<sub>b</sub></i><sub>2</sub> = 0.61% but 7.2% lower at <i>ρ<sub>b</sub></i><sub>2</sub> = 3.03% than that of steel RC beams. In addition, CFRP RC beams exhibit around 13% greater ultimate deflection compared to steel RC beams. The difference of moment redistribution between CFRP and steel RC beams diminishes as <i>ρ<sub>b</sub></i><sub>2</sub> increases. ACI 318-19 appears to be conservative, and it leads to more accurate predictions of moment redistribution in CFRP RC beams than that in steel RC beams. |
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