Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

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

철근콘크리트보의 인장철근비와 크기효과에 의한 전단강도 특성 연구

  • 유인근 (금오공과대학교 건축학부) ;
  • 노형진 (금오공과대학교 건축학부) ;
  • 이호경 (금오공과대학교 건축학부) ;
  • 백승민 (금오공과대학교 건축학부) ;
  • 김우석 (금오공과대학교 건축학부) ;
  • 곽윤근 (금오공과대학교 건축학부)
  • Received : 2019.10.17
  • Accepted : 2020.02.07
  • Published : 2020.02.28
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Abstract

The main objective of this experimental study is to investigate shear strength of reinforced concrete beams according to longitudinal reinforcement ratio (ρ) and size effect. In order to find out the shear strength according to the tensile reinforcement ratio, in particular, the main variables are 100%, 75% and 50% of ρ=0.01 which is widely used in construction field. A total of twelve RC beams were tested under 4-point loading conditions. In addition to the existing proposal equations, the theoretical values such as KBC and ACI equations are compared with the experimental data. Through this analysis, this study is designed to provide more reasonable equations for shear design of reinforced concrete beams. When shear reinforcement bar spacing of nine specimens (R*-1, R*-2, and R*-3 series) fixed as d/s=2.0 and three specimens of R*-4 series fixed as d/s=1.5 are compared, the shear strength of two groups showed similar values. As a result, the current standard of d/s=2.0 for shear reinforcement bar spacing may be somewhat alleviated.

Keywords

Acknowledgement

Supported by : 한국연구재단

이 연구는 2019년도 한국연구재단 연구비 지원에 의한 결과의 일부임. 과제번호: NRF-2018R1D1A1B07045066

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