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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2021
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oai:doaj.org-article:acd1cf7b96514049950145ecd1f37b7c2021-11-25T18:13:13ZFlexural Behavior of Two-Span Continuous CFRP RC Beams10.3390/ma142267461996-1944https://doaj.org/article/acd1cf7b96514049950145ecd1f37b7c2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/6746https://doaj.org/toc/1996-1944This 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.Miao PangSensen ShiHan HuTiejiong LouMDPI AGarticlecarbon-reinforced polymernumerical analysisstructural behaviormoment redistributionTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6746, p 6746 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
carbon-reinforced polymer numerical analysis structural behavior moment redistribution Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
| spellingShingle |
carbon-reinforced polymer numerical analysis structural behavior moment redistribution Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Miao Pang Sensen Shi Han Hu Tiejiong Lou Flexural Behavior of Two-Span Continuous CFRP RC Beams |
| 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. |
| format |
article |
| author |
Miao Pang Sensen Shi Han Hu Tiejiong Lou |
| author_facet |
Miao Pang Sensen Shi Han Hu Tiejiong Lou |
| author_sort |
Miao Pang |
| title |
Flexural Behavior of Two-Span Continuous CFRP RC Beams |
| title_short |
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_sort |
flexural behavior of two-span continuous cfrp rc beams |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/acd1cf7b96514049950145ecd1f37b7c |
| work_keys_str_mv |
AT miaopang flexuralbehavioroftwospancontinuouscfrprcbeams AT sensenshi flexuralbehavioroftwospancontinuouscfrprcbeams AT hanhu flexuralbehavioroftwospancontinuouscfrprcbeams AT tiejionglou flexuralbehavioroftwospancontinuouscfrprcbeams |
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1718411458101903360 |