Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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A Characteristic Study on Shear Strength of High Strength Reinforced Concrete Beams according to Shear Reinforcement Ratio and Beam Section Size

전단철근비와 보의 단면크기에 따른 고강도 철근콘크리트보의 전단강도 특성 연구

  • 박나정 (금오공과대학교 건축학부) ;
  • 노형진 (금오공과대학교 건축학부) ;
  • 유인근 (금오공과대학교 건축학부) ;
  • 백승민 (금오공과대학교 건축학부) ;
  • 김우석 (금오공과대학교 건축학부) ;
  • 곽윤근 (금오공과대학교 건축학부)
  • Received : 2020.06.22
  • Accepted : 2020.08.16
  • Published : 2020.08.30
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Abstract

The purpose of this study is to investigate the shear strength of high strength reinforced concrete beams according to shear reinforcement ratio and beam section size. A total of twelve specimens were tested and designed concrete compressive strength is 50 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 H1 (225×338 mm), H2 (270×405 mm) and H3 (315×473mm) respectively. The experimental results show that specimens represent various failure modes such as diagonal tensile failure (DTF), bond failure (BF), shear compression failure (SCF) and flexural compression failure (FCF). In the H1 series, the shear strength increased by 92.0%, 94.1% and 128.4% respectively as the shear reinforcement ratio increased, 103.8%, 138% and 143% respectively in the H2 series, 131.1%, 168.7% and 151.7% respectively in the H3 series. The decreasing rate of shear strength increased as the beam's effective width increased, which is considered to be due to the size effect. Then, it is shown that the decreasing rate of shear strength increases as d/s increases, and it can be seen that the effect of the size effect increases as the spacing between shear reinforcing bars decreases. As compared to the standard and the proposed equations, theoretical values by proposed equation of Zsutty, Bazant, and Lee has compared relatively well with experimental values.

Keywords

Acknowledgement

이 논문은 2020년도 한국연구재단 연구비 지원에 의한 연구의 결과임(과제번호:NRF-2018R1D1A1B07045066).

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