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Title |
Hysteretic Behavior of Diagonally Reinforced Concrete Coupling Beams According to Aspect Ratio and Volume Fraction of Steel Fiber Under Cyclic Loading
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Authors |
최지윤(Ji-Yoon Choi) ; 손동희(Dong-Hee Son) ; 배백일(Baek-Il Bae) ; 최창식(Chang-Sik Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.3.84 |
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Keywords |
연결보; 철근콘크리트 연결보; 횡보강근; 강섬유; 강섬유 형상비; 혼입률 Coupling beams; Reinforced concrete coupling beam; Transverse reinforcement; Steel fiber; Steel fiber aspect ratio; Volume fraction |
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Abstract |
In this study, an experimental study was conducted to analyze the hysteresis behavior according to the steel fiber aspect ratio and volume fraction of diagonally reinforced concrete coupling beams under to cyclic loading. The aspect ratio and volume fraction of the steel fibers were set as the main variables, and 4 specimens were fabricated in which the amount of transverse reinforcement of the coupling beam suggested in the domestic building structural standard was relaxed by about 53%. In the experiment, cyclic loading experiments were performed in the displacement control method in accordance with ACI 374.2R-13, and as a result of the experiment, it was found that all specimens containing steel fibers exceeded the nominal shear strength suggested by the current structural standards. As the aspect ratio of the steel fibers increased, the steel fibers prevented the buckling of the diagonal reinforcement, and the bridging effect of the steel fibers held the crack surface of the concrete. The shear strength, stiffness reduction and energy dissipation capacity of the specimens containing steel fibers were superior to those of the Vf0 specimens without steel fibers. Therefore, it is judged that the steel fiber reinforced concrete can relieve the details of the transverse reinforced.
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