Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads
Because researchers are aiming to restore the deformation and minimize the crack width of existing concrete structures, the strengthening technology of prestressed carbon-fiber-reinforced plastic (CFRP) is currently the focus of many studies and applications. In terms of the strengthening of a prest...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-08-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/13/8/2115 |
| _version_ | 1797585222287491072 |
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| author | Huijuan Wang Changyong Li Sihao Song Yao Wang Qingxin Meng Fenglan Li |
| author_facet | Huijuan Wang Changyong Li Sihao Song Yao Wang Qingxin Meng Fenglan Li |
| author_sort | Huijuan Wang |
| collection | DOAJ |
| description | Because researchers are aiming to restore the deformation and minimize the crack width of existing concrete structures, the strengthening technology of prestressed carbon-fiber-reinforced plastic (CFRP) is currently the focus of many studies and applications. In terms of the strengthening of a prestressed CFRP sheet on the flexural performance of cracked reinforced concrete beams under repeated loads, a four-point bending test of 12 beams was conducted considering the prestress degree reflected by the amount and the prestress force of the CFRP sheet. The longitudinal strengthened CFRP sheet was bonded on the bottom surface of the test beam and fixed by U-jacket CFRP sheets at the ends after tensioning. The strains of concrete, longitudinal tensile steel bars and CFRP sheets were measured at the pure bending segment of test beams, while the cracks, midspan deflection and failure pattern were recorded. The results show that the normal strain on the mid-span section of the strengthened beams by the prestress CFRP sheets was fitted for the assumption of plane section, the cracks and mid-span deflection decreased with the prestress degree of the CFRP sheets to provide better serviceability for the strengthened beams, the load capacity could be increased by 41.0–88.8% at the yield of longitudinal tensile steel bars and increased by 41.9–74.8% at the ultimate state and the ductility at the failure state was sharply reduced by 54.9–186%. The peeling off of broken CFRP sheets played a role in controlling the failure pattern of the strengthened beams under repeated loads. Finally, methods for predicting the bending performance of reinforced concrete beams strengthened by prestressed CFRP sheets were proposed. This study enriches the knowledge about damaged reinforced concrete beams that were strengthened with prestressed CFRP sheets. |
| first_indexed | 2024-03-11T00:04:01Z |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-11T00:04:01Z |
| publishDate | 2023-08-01 |
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| series | Buildings |
| spelling | doaj.art-0c7d503b60084e4c9913e803579655942023-11-19T00:31:43ZengMDPI AGBuildings2075-53092023-08-01138211510.3390/buildings13082115Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated LoadsHuijuan Wang0Changyong Li1Sihao Song2Yao Wang3Qingxin Meng4Fenglan Li5Low-Carbon Eco-Building Materials Technology Innovation Center of Xuchang City, Civil Engineering and Architecture School, Zhongyuan Institute of Science and Technology, Zhengzhou 450046, ChinaInternational Joint Research Lab for Eco-Building Materials and Engineering of Henan, Collaborative Innovation Center for Efficient Utilization of Water Resources, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaSchool of Civil Engineering and Communications, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaChina Construction Seventh Engineering Bureau Co., Ltd., Zhengzhou 450004, ChinaChina Construction Seventh Engineering Bureau Co., Ltd., Zhengzhou 450004, ChinaLow-Carbon Eco-Building Materials Technology Innovation Center of Xuchang City, Civil Engineering and Architecture School, Zhongyuan Institute of Science and Technology, Zhengzhou 450046, ChinaBecause researchers are aiming to restore the deformation and minimize the crack width of existing concrete structures, the strengthening technology of prestressed carbon-fiber-reinforced plastic (CFRP) is currently the focus of many studies and applications. In terms of the strengthening of a prestressed CFRP sheet on the flexural performance of cracked reinforced concrete beams under repeated loads, a four-point bending test of 12 beams was conducted considering the prestress degree reflected by the amount and the prestress force of the CFRP sheet. The longitudinal strengthened CFRP sheet was bonded on the bottom surface of the test beam and fixed by U-jacket CFRP sheets at the ends after tensioning. The strains of concrete, longitudinal tensile steel bars and CFRP sheets were measured at the pure bending segment of test beams, while the cracks, midspan deflection and failure pattern were recorded. The results show that the normal strain on the mid-span section of the strengthened beams by the prestress CFRP sheets was fitted for the assumption of plane section, the cracks and mid-span deflection decreased with the prestress degree of the CFRP sheets to provide better serviceability for the strengthened beams, the load capacity could be increased by 41.0–88.8% at the yield of longitudinal tensile steel bars and increased by 41.9–74.8% at the ultimate state and the ductility at the failure state was sharply reduced by 54.9–186%. The peeling off of broken CFRP sheets played a role in controlling the failure pattern of the strengthened beams under repeated loads. Finally, methods for predicting the bending performance of reinforced concrete beams strengthened by prestressed CFRP sheets were proposed. This study enriches the knowledge about damaged reinforced concrete beams that were strengthened with prestressed CFRP sheets.https://www.mdpi.com/2075-5309/13/8/2115cracked reinforced concrete beamsprestressed CFRP sheetbending performancerepeated loadstrengthening effect |
| spellingShingle | Huijuan Wang Changyong Li Sihao Song Yao Wang Qingxin Meng Fenglan Li Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads Buildings cracked reinforced concrete beams prestressed CFRP sheet bending performance repeated load strengthening effect |
| title | Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads |
| title_full | Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads |
| title_fullStr | Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads |
| title_full_unstemmed | Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads |
| title_short | Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads |
| title_sort | flexural performance of cracked reinforced concrete beams strengthened with prestressed cfrp sheets under repeated loads |
| topic | cracked reinforced concrete beams prestressed CFRP sheet bending performance repeated load strengthening effect |
| url | https://www.mdpi.com/2075-5309/13/8/2115 |
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