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자료유형
학술저널
저자정보
노형진 (금오공과대학교) 유인근 (금오공과대학교) 이호경 (금오공과대학교) 백승민 (금오공과대학교) 김우석 (금오공과대학교) 곽윤근 (금오공과대학교)
저널정보
대한건축학회 대한건축학회 논문집 - 구조계 大韓建築學會論文集 構造系 第35卷 第6號(通卷 第368號)
발행연도
2019.6
수록면
111 - 119 (9page)

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The purpose of this study is to investigate the shear strength of reinforced concrete beam according to beam section size and shear reinforcement ratio. A total of nine specimens were tested and designed concrete compressive strength is 24 MPa. The main variables are shear reinforcement ratio and beam section size fixed with shear span to depth ratio (a/d = 2.5), the tensile reinforcement ratio (ρ = 0.013) and width to depth ratio (h/b = 1.5). The test specimens were divided into three series of S1 (225× 338 mm), S2 (270× 405 mm) and S3 (315× 473 mm), respectively. The experimental results show that all specimens represent diagonal tensile failure. For S<SUP>*</SUP>-1 specimens (d/s=0), the shear strength decreased by 33% and 46% with increasing the beam effective depth, 26% and 33% for S<SUP>*</SUP>-2 specimens (d/s=1.5) and 16% and 20% for S<SUP>*</SUP>-3 specimens (d/s=2.0) respectively. As the shear reinforcement ratio increases, the decrease range in shear strength decreases. In other words, this means that as the shear reinforcement ratio increases, the size effect of concrete decreases. In the S1 series, the shear strength increased by 39% and 41% as the shear reinforcement ratio increased, 54% and 76% in the S2 series and 66% and 100% in the S3 series, respectively. As the effective depth of beam increases, the increase range of shear strength increases. This means that the effect of shear reinforcement increases as the beam effective depth increases. As a result of comparing experimental values with theoretical values by standard equation and proposed equation, the ratio by Zsutty and Bazant´s equation is 1.30 ~ 1.36 and the ratio by KBC1 and KBC2 is 1.55~.163, respectively. Therefore, Zsutty and Bazant"s proposed equation is more likely to reflect the experimental data. The current standard for shear reinforcement ratio (i.e.,  S<SUB>max</SUB>=d/2) is expected to be somewhat relaxed because the ratio of experimental values to theoretical values was found to be 1.01 ~ 1.44 for most specimens.

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Abstract
1. 서론
2. 실험
3. 실험결과 및 분석
4. 결론
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UCI(KEPA) : I410-ECN-0101-2019-540-000863754