Study on Dynamic Splitting Properties of S-PP Hybrid Fiber Concrete after High Temperatures
To study the dynamic tensile mechanical properties of steel polypropylene hybrid fiber reinforced concrete (SP-HFRC) after high temperature, split Hopkinson pressure bar (SHPB) dynamic splitting tests were carried out, and the optimal fiber content combination was obtained. With the plain concrete (...
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| Format: | Article |
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MDPI AG
2022-08-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/17/8437 |
| _version_ | 1797496597667381248 |
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| author | Zehui Xu Tong He Yongwang Liu Xinzuo Chen Lei Liu |
| author_facet | Zehui Xu Tong He Yongwang Liu Xinzuo Chen Lei Liu |
| author_sort | Zehui Xu |
| collection | DOAJ |
| description | To study the dynamic tensile mechanical properties of steel polypropylene hybrid fiber reinforced concrete (SP-HFRC) after high temperature, split Hopkinson pressure bar (SHPB) dynamic splitting tests were carried out, and the optimal fiber content combination was obtained. With the plain concrete (PC) as the control, the effects of fiber addition on energy dissipation and failure forms of concrete specimens after high temperatures were analyzed. LS-DYNA software was used to simulate the dynamic splitting test. The results show that the splitting strength of specimens increases first and then deteriorates with the increase of temperature. After high temperatures, HFRC has a positive and negative fiber hybrid effect. Among the studied fiber mixture combinations, S1PP0.2 (1 vol% steel fiber + 0.2 vol% polypropylene fiber) concrete has the best splitting resistance. Compared with PC, the splitting strength increases by 106.8% at 25 °C and 128.2% at 800 °C. From the perspective of energy, we can conclude that adding hybrid fiber can significantly improve the dynamic splitting and tensile toughness of concrete after high temperatures, and defining damage variables can better characterize the damage degree of concrete. PC cracks seriously after high temperatures, while S1PP0.2 concrete cracks but does not disperse at 800 °C, showing ductile failure characteristics. By modifying some parameters of the HJC model, the state of high-temperature concrete mechanical properties can be better characterized after deterioration. The simulated failure process shows an excellent agreement with the experimental results. |
| first_indexed | 2024-03-10T03:05:55Z |
| format | Article |
| id | doaj.art-aae3c349ac6f4f22bed75dc52844faa9 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T03:05:55Z |
| publishDate | 2022-08-01 |
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| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-aae3c349ac6f4f22bed75dc52844faa92023-11-23T12:39:42ZengMDPI AGApplied Sciences2076-34172022-08-011217843710.3390/app12178437Study on Dynamic Splitting Properties of S-PP Hybrid Fiber Concrete after High TemperaturesZehui Xu0Tong He1Yongwang Liu2Xinzuo Chen3Lei Liu4Faculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaTo study the dynamic tensile mechanical properties of steel polypropylene hybrid fiber reinforced concrete (SP-HFRC) after high temperature, split Hopkinson pressure bar (SHPB) dynamic splitting tests were carried out, and the optimal fiber content combination was obtained. With the plain concrete (PC) as the control, the effects of fiber addition on energy dissipation and failure forms of concrete specimens after high temperatures were analyzed. LS-DYNA software was used to simulate the dynamic splitting test. The results show that the splitting strength of specimens increases first and then deteriorates with the increase of temperature. After high temperatures, HFRC has a positive and negative fiber hybrid effect. Among the studied fiber mixture combinations, S1PP0.2 (1 vol% steel fiber + 0.2 vol% polypropylene fiber) concrete has the best splitting resistance. Compared with PC, the splitting strength increases by 106.8% at 25 °C and 128.2% at 800 °C. From the perspective of energy, we can conclude that adding hybrid fiber can significantly improve the dynamic splitting and tensile toughness of concrete after high temperatures, and defining damage variables can better characterize the damage degree of concrete. PC cracks seriously after high temperatures, while S1PP0.2 concrete cracks but does not disperse at 800 °C, showing ductile failure characteristics. By modifying some parameters of the HJC model, the state of high-temperature concrete mechanical properties can be better characterized after deterioration. The simulated failure process shows an excellent agreement with the experimental results.https://www.mdpi.com/2076-3417/12/17/8437dynamic splittinghigh temperaturehybrid fiberenergy dissipationnumerical simulation |
| spellingShingle | Zehui Xu Tong He Yongwang Liu Xinzuo Chen Lei Liu Study on Dynamic Splitting Properties of S-PP Hybrid Fiber Concrete after High Temperatures Applied Sciences dynamic splitting high temperature hybrid fiber energy dissipation numerical simulation |
| title | Study on Dynamic Splitting Properties of S-PP Hybrid Fiber Concrete after High Temperatures |
| title_full | Study on Dynamic Splitting Properties of S-PP Hybrid Fiber Concrete after High Temperatures |
| title_fullStr | Study on Dynamic Splitting Properties of S-PP Hybrid Fiber Concrete after High Temperatures |
| title_full_unstemmed | Study on Dynamic Splitting Properties of S-PP Hybrid Fiber Concrete after High Temperatures |
| title_short | Study on Dynamic Splitting Properties of S-PP Hybrid Fiber Concrete after High Temperatures |
| title_sort | study on dynamic splitting properties of s pp hybrid fiber concrete after high temperatures |
| topic | dynamic splitting high temperature hybrid fiber energy dissipation numerical simulation |
| url | https://www.mdpi.com/2076-3417/12/17/8437 |
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