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Title |
Shear Strength Analysis of Steel Fiber-Reinforced Concrete Beams without Stirrups Considering Size Effect
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Authors |
오경수(Gyeong-Su Oh) ; 손동희(Dong-Hee Son) ; 최현기(Hyun-Ki Choi) ; 배백일(Baek-Il Bae) ; 최창식(Chang-Sik Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.4.367 |
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Keywords |
철근콘크리트 보, 전단강도, 크기효과, 강섬유 reinforced concrete beam, shear strength, size effect, steel fiber |
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Abstract |
This study experimentally compares the shear strength and size effect of plain concrete (PC) beams and steel fiber-reinforced concrete (SFRC) beams without shear reinforcement. Beam specimens with heights of 350, 650, and 950 mm were fabricated, and steel fiber volume ratios were set at 0 % and 1 %. The experimental results indicated that SFRC beams exhibited higher shear strength compared to PC beams, and the reduction in shear strength due to size increase was relatively lower. This was attributed to the bridging effect of steel fibers across crack faces, effectively controlling crack propagation. However, current design standards do not adequately reflect the enhanced shear strength and reduced size effect provided by steel fibers. Therefore, there is a need for a new shear strength formulation that properly accounts for the size effect in SFRC beams.
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