Study on flexural cracking characteristics of polypropylene fiber reinforced concrete beams with BFRP bars
Concrete beams reinforced with BFRP bars have problems such as low stiffness, wide cracks, and brittle flexural failure. Fibers can improve the cracking characteristics. One ordinary concrete BFRP beam and four PP - FRC BFRP beams were fabricated to investigate the influence of the volume ratio of P...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525001706 |
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| author | Huayi Wang Ming Zhou Bingyan Wei Chao Wu Zhiyi Tang Sitian Zhang Jia He |
| author_facet | Huayi Wang Ming Zhou Bingyan Wei Chao Wu Zhiyi Tang Sitian Zhang Jia He |
| author_sort | Huayi Wang |
| collection | DOAJ |
| description | Concrete beams reinforced with BFRP bars have problems such as low stiffness, wide cracks, and brittle flexural failure. Fibers can improve the cracking characteristics. One ordinary concrete BFRP beam and four PP - FRC BFRP beams were fabricated to investigate the influence of the volume ratio of PP fibers and the reinforcement ratio of BFRP on the flexural cracking characteristics of the beams. The results show that PP fibers do not change the flexural failure characteristics of BFRP beams but can increase the ultimate load (by 10.4 % - 36.6 %) and the deflection corresponding to the ultimate load (by 20.9 % - 50.6 %). PP fibers can increase the ultimate strain of coordinated deformation between the concrete in the flexural zone and BFRP bars by 8.77–12.79 times. PP fibers can significantly delay the damage of the concrete in the compression zone, increase the ultimate compressive strain by 60.6 % - 120.3 %, and raise the ductility coefficient by 76.9 % - 153.9 %. The crack height is reduced by 13.9 % - 53.3 % at the same curvature. When the flexural bearing capacity is 80 %, the average crack spacing is reduced by 6.1 % - 13.4 %. Adding PP fibers increased the torque value corresponding to a crack width of 0.8 mm by 28.4–77.6 %. According to the prediction formula for the cracking characteristics of ordinary concrete BFRP beams in GB 50608–2020, the calculation formulas for the average crack spacing and the maximum crack width of PP - FRC BFRP beams are proposed, and their prediction accuracy is better than that of the code formulas. |
| format | Article |
| id | doaj-art-be1c68f2441c47d598ae6a8a40202ba4 |
| institution | Kabale University |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-be1c68f2441c47d598ae6a8a40202ba42025-02-11T04:34:55ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e04372Study on flexural cracking characteristics of polypropylene fiber reinforced concrete beams with BFRP barsHuayi Wang0Ming Zhou1Bingyan Wei2Chao Wu3Zhiyi Tang4Sitian Zhang5Jia He6School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, ChinaSchool of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, China; Corresponding authors.School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, ChinaSchool of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, ChinaSchool of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, ChinaSchool of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, ChinaDepartment of the Built Environment, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, the Netherlands; Corresponding authors.Concrete beams reinforced with BFRP bars have problems such as low stiffness, wide cracks, and brittle flexural failure. Fibers can improve the cracking characteristics. One ordinary concrete BFRP beam and four PP - FRC BFRP beams were fabricated to investigate the influence of the volume ratio of PP fibers and the reinforcement ratio of BFRP on the flexural cracking characteristics of the beams. The results show that PP fibers do not change the flexural failure characteristics of BFRP beams but can increase the ultimate load (by 10.4 % - 36.6 %) and the deflection corresponding to the ultimate load (by 20.9 % - 50.6 %). PP fibers can increase the ultimate strain of coordinated deformation between the concrete in the flexural zone and BFRP bars by 8.77–12.79 times. PP fibers can significantly delay the damage of the concrete in the compression zone, increase the ultimate compressive strain by 60.6 % - 120.3 %, and raise the ductility coefficient by 76.9 % - 153.9 %. The crack height is reduced by 13.9 % - 53.3 % at the same curvature. When the flexural bearing capacity is 80 %, the average crack spacing is reduced by 6.1 % - 13.4 %. Adding PP fibers increased the torque value corresponding to a crack width of 0.8 mm by 28.4–77.6 %. According to the prediction formula for the cracking characteristics of ordinary concrete BFRP beams in GB 50608–2020, the calculation formulas for the average crack spacing and the maximum crack width of PP - FRC BFRP beams are proposed, and their prediction accuracy is better than that of the code formulas.http://www.sciencedirect.com/science/article/pii/S2214509525001706Polypropylene fiber-reinforced concreteFiber-reinforced polymersCrack widthDuctilityCrack behavior |
| spellingShingle | Huayi Wang Ming Zhou Bingyan Wei Chao Wu Zhiyi Tang Sitian Zhang Jia He Study on flexural cracking characteristics of polypropylene fiber reinforced concrete beams with BFRP bars Case Studies in Construction Materials Polypropylene fiber-reinforced concrete Fiber-reinforced polymers Crack width Ductility Crack behavior |
| title | Study on flexural cracking characteristics of polypropylene fiber reinforced concrete beams with BFRP bars |
| title_full | Study on flexural cracking characteristics of polypropylene fiber reinforced concrete beams with BFRP bars |
| title_fullStr | Study on flexural cracking characteristics of polypropylene fiber reinforced concrete beams with BFRP bars |
| title_full_unstemmed | Study on flexural cracking characteristics of polypropylene fiber reinforced concrete beams with BFRP bars |
| title_short | Study on flexural cracking characteristics of polypropylene fiber reinforced concrete beams with BFRP bars |
| title_sort | study on flexural cracking characteristics of polypropylene fiber reinforced concrete beams with bfrp bars |
| topic | Polypropylene fiber-reinforced concrete Fiber-reinforced polymers Crack width Ductility Crack behavior |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525001706 |
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