Flexural Strength Design of Hybrid FRP-Steel Reinforced Concrete Beams
Through proper arranging of a hybrid combination of longitudinal fiber reinforced polymer (FRP) bars and steel bars in the tensile region of the beam, the advantages of both FRP and steel materials can be sufficiently exploited to enhance the flexural capacity and ductility of a concrete beam. In th...
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MDPI AG
2021-10-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/21/6400 |
| _version_ | 1797512211986382848 |
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| author | Binbin Zhou Ruo-Yang Wu Yangqing Liu Xiaohui Zhang Shiping Yin |
| author_facet | Binbin Zhou Ruo-Yang Wu Yangqing Liu Xiaohui Zhang Shiping Yin |
| author_sort | Binbin Zhou |
| collection | DOAJ |
| description | Through proper arranging of a hybrid combination of longitudinal fiber reinforced polymer (FRP) bars and steel bars in the tensile region of the beam, the advantages of both FRP and steel materials can be sufficiently exploited to enhance the flexural capacity and ductility of a concrete beam. In this paper, a methodology for the flexural strength design of hybrid FRP-steel reinforced concrete (RC) beams is proposed. Firstly, based on the mechanical features of reinforcement and concrete and according to the latest codified provisions of longitudinal reinforcement conditions to ensure ductility level, the design-oriented allowable ranges of reinforcement ratio corresponding to three common flexural failure modes are specified. Subsequently, the calculation approach of nominal flexural strength of hybrid FRP-steel RC beams is established following the fundamental principles of equilibrium and compatibility. In addition to the common moderately-reinforced beams, the proposed general calculation approach is also applicable to lightly-reinforced beams and heavily-reinforced beams, which are widely used but rarely studied. Furthermore, the calculation process is properly simplified and the calculation accuracy is validated by the experimental results of hybrid FRP-steel RC beams in the literature. Finally, with the ductility analysis, a novel strength reduction factor represented by net tensile steel strain and reinforcement ratio is proposed for hybrid FRP-steel RC beams. |
| first_indexed | 2024-03-10T05:57:40Z |
| format | Article |
| id | doaj.art-4c23ec5a278544ef936ca429f1ff5f2d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T05:57:40Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4c23ec5a278544ef936ca429f1ff5f2d2023-11-22T21:11:33ZengMDPI AGMaterials1996-19442021-10-011421640010.3390/ma14216400Flexural Strength Design of Hybrid FRP-Steel Reinforced Concrete BeamsBinbin Zhou0Ruo-Yang Wu1Yangqing Liu2Xiaohui Zhang3Shiping Yin4Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, School of Mechanics & Civil Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaWilson and Company, South Jordan, UT 84096, USASchool of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaKey Laboratory of C & PC Structures of Ministry of Education, National Prestress Engineering Research Center, Southeast University, Nanjing 210096, ChinaJiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, School of Mechanics & Civil Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaThrough proper arranging of a hybrid combination of longitudinal fiber reinforced polymer (FRP) bars and steel bars in the tensile region of the beam, the advantages of both FRP and steel materials can be sufficiently exploited to enhance the flexural capacity and ductility of a concrete beam. In this paper, a methodology for the flexural strength design of hybrid FRP-steel reinforced concrete (RC) beams is proposed. Firstly, based on the mechanical features of reinforcement and concrete and according to the latest codified provisions of longitudinal reinforcement conditions to ensure ductility level, the design-oriented allowable ranges of reinforcement ratio corresponding to three common flexural failure modes are specified. Subsequently, the calculation approach of nominal flexural strength of hybrid FRP-steel RC beams is established following the fundamental principles of equilibrium and compatibility. In addition to the common moderately-reinforced beams, the proposed general calculation approach is also applicable to lightly-reinforced beams and heavily-reinforced beams, which are widely used but rarely studied. Furthermore, the calculation process is properly simplified and the calculation accuracy is validated by the experimental results of hybrid FRP-steel RC beams in the literature. Finally, with the ductility analysis, a novel strength reduction factor represented by net tensile steel strain and reinforcement ratio is proposed for hybrid FRP-steel RC beams.https://www.mdpi.com/1996-1944/14/21/6400hybrid reinforced concrete beamsflexural failure modesnominal flexural strengthstrength reduction factorductility analysis |
| spellingShingle | Binbin Zhou Ruo-Yang Wu Yangqing Liu Xiaohui Zhang Shiping Yin Flexural Strength Design of Hybrid FRP-Steel Reinforced Concrete Beams Materials hybrid reinforced concrete beams flexural failure modes nominal flexural strength strength reduction factor ductility analysis |
| title | Flexural Strength Design of Hybrid FRP-Steel Reinforced Concrete Beams |
| title_full | Flexural Strength Design of Hybrid FRP-Steel Reinforced Concrete Beams |
| title_fullStr | Flexural Strength Design of Hybrid FRP-Steel Reinforced Concrete Beams |
| title_full_unstemmed | Flexural Strength Design of Hybrid FRP-Steel Reinforced Concrete Beams |
| title_short | Flexural Strength Design of Hybrid FRP-Steel Reinforced Concrete Beams |
| title_sort | flexural strength design of hybrid frp steel reinforced concrete beams |
| topic | hybrid reinforced concrete beams flexural failure modes nominal flexural strength strength reduction factor ductility analysis |
| url | https://www.mdpi.com/1996-1944/14/21/6400 |
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