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Title |
Shear Strength of Ultra-High Performance Fiber-Reinforced Concrete(UHPFRC) I-shaped Beams without Stirrup
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Authors |
이지형(Ji-Hyung Lee) ; 홍성걸(Sung-Gul Hong) |
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DOI |
https://doi.org/10.4334/JKCI.2017.29.1.053 |
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Keywords |
강섬유보강 초고성능 콘크리트(UHPFRC) ; 재료인장강도 ; 응력 재분배 ; 파괴 모드 ; 전단 강도 UHPFRC ; material tensile strength ; stress redistribution ; failure mode ; shear strength |
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Abstract |
Ultra-high performance fiber-reinforced concrete (UHPFRC) is characterized by a post-cracking residual tensile strength with a large tensile strain as well as a high compressive strength. To determine a material tensile strength of UHPFRC, three-point loading test on notched prism and direct tensile test on doubly notched plate were compared and then the design tensile strength is decided. Shear tests on nine I-shaped beams with varied types of fiber volume ratio, shear span ratio and size effect were conducted to investigate shear behavior in web. From the test results, the stress redistribution ability represented as diagonal cracked zone was quantified by inclination of principal stress in web. The test results shows that the specimens were capable of resistance to shear loading without stirrup in a range of large deformation and the strength increase with post-cracking behavior is stable. However at the ultimate state all test specimens failed as a crack localization in the damaged zone and the shear strength of specimens is affected by shear span ratio and effective depth. Strength predictions show that the existing recommendations should be modified considering shear span ratio and effective depth as design parameters.
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