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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MDPI AG
2021-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/22/6746 |
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| author | Miao Pang Sensen Shi Han Hu Tiejiong Lou |
| author_facet | Miao Pang Sensen Shi Han Hu Tiejiong Lou |
| author_sort | Miao Pang |
| collection | DOAJ |
| description | 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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| spelling | doaj.art-acd1cf7b96514049950145ecd1f37b7c2023-11-23T00:08:02ZengMDPI AGMaterials1996-19442021-11-011422674610.3390/ma14226746Flexural Behavior of Two-Span Continuous CFRP RC BeamsMiao Pang0Sensen Shi1Han Hu2Tiejiong Lou3Department of Civil Engineering, Zhejiang University, Hangzhou 310058, ChinaHubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, ChinaHubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, ChinaHubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, ChinaThis 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.https://www.mdpi.com/1996-1944/14/22/6746carbon-reinforced polymernumerical analysisstructural behaviormoment redistribution |
| spellingShingle | Miao Pang Sensen Shi Han Hu Tiejiong Lou Flexural Behavior of Two-Span Continuous CFRP RC Beams Materials carbon-reinforced polymer numerical analysis structural behavior moment redistribution |
| title | Flexural Behavior of Two-Span Continuous CFRP RC Beams |
| title_full | Flexural Behavior of Two-Span Continuous CFRP RC Beams |
| title_fullStr | Flexural Behavior of Two-Span Continuous CFRP RC Beams |
| title_full_unstemmed | Flexural Behavior of Two-Span Continuous CFRP RC Beams |
| title_short | Flexural Behavior of Two-Span Continuous CFRP RC Beams |
| title_sort | flexural behavior of two span continuous cfrp rc beams |
| topic | carbon-reinforced polymer numerical analysis structural behavior moment redistribution |
| url | https://www.mdpi.com/1996-1944/14/22/6746 |
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