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Title |
Investigation on the Flexural and Shear Behavior of Fiber Reinforced UHSC Members Reinforced with Stirrups
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Authors |
여옥경(Ok-Kyung Yuh) ; 지규현(Kyu-Hyun, Ji) ; 배백일(Baek-Il Bae) |
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DOI |
https://doi.org/10.11112/jksmi.2019.23.7.152 |
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Keywords |
초고강도 콘크리트; 강섬유; 전단철근; 휨강도; 전단강도 ultra high strength concrete; steel fiber; shear reinforcement; flexural strength; shear strength |
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Abstract |
In this paper, effect of steel fiber inclusion, compressive strength of matrix, shear reinforcement and shear span to depth ratio on the flexural behavior of UHPFRC(Ultra High Performance Fiber Reinforced Concrete) were investigated with test of 10-UHPFRC beam specimens. All test specimens were subjected to the flexural static loading. It was shown that steel fiber significantly improve the shear strength of UHPFRC beams. 2% volume fraction of steel fiber change the mode of failure from shear failure to flexural failure and delayed the failure of compressive strut with comparatively short shear span to depth ratio. UHPFRC beams without steel fiber had a 45-degree crack angle and fiber reinforced one had lower crack angle. Shear reinforcement contribution on shear strength of beams can be calculated by 45-degree truss model with acceptable conservatism. Using test results, French and Korean UHPFRC design recommendations were evaluated. French recommendation have shown conservative results on flexural behavior but Korean recommendation have shown overestimation for flexural strength. Both recommendations have shown the conservatism on the flexural ductility and shear strength either.
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