Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Evaluations of the Maximum Shear Reinforcement of Reinforced Concrete Beams

철근콘크리트 보의 최대 전단철근비에 대한 평가

  • Hwang, Hyun-Bok (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Moon, Cho-Hwa (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Lee, Jung-Yoon (Dept. of Architectural Engineering, Sungkyunkwan University)
  • 황현복 (성균관대학교 건축공학과) ;
  • 문초화 (성균관대학교 건축공학과) ;
  • 이정윤 (성균관대학교 건축공학과)
  • Published : 2009.12.31
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Abstract

The requirements of the maximum shear reinforcement in the EC2-02 and CSA-04, which are developed based on the truss model, are quite different to those in the ACI-08 code and AIJ-99 code, which are empirical equations. The ACI 318-08, CSA-04, and EC2-02 codes provide an expression for the maximum amount of shear reinforcement ratio as a function of the concrete compressive strength, but Japanese code does not take the influence of the concrete compressive strength into account. For high strength concrete, the maximum amount of shear reinforcement calculated by the EC2-02 and CSA-04 is much greater than that calculated by the ACI 318-08. Ten RC beams having various shear reinforcement ratios were tested and their corresponding shear stress-shear strain curves and failure modes were compared to the predicted ones obtained by the current design codes.

변환각트러스모델에 근거한 EC2-02 기준식이나 CSA-04 기준식의 최대 전단보강철근비는 반경험적 방법에 근거한 ACI 318-08 기준식이나 AIJ-99 기준식에서 요구하는 최대 전단보강철근비와 많은 차이가 있다. ACI 318-08 기준식, CSA-04 기준식 및 EC2-02 기준식은 콘크리트의 압축강도에 따라서 최대 전단보강철근비가 증가하지만 AIJ-99 기준식은 일정한 값이 적용된다. 고강도콘크리트에 대하여 EC2-02 기준식이나 CSA-04 기준식이 요구하는 최대 전단보강철근비는 ACI 318-08 기준식이 요구하는 최대 철근비에 비하여 매우 크다. 이 연구에서는 10개의 철근콘크리트 보 실험을 통하여 전단보강철근의 양과 콘크리트의 압축강도가 최대 전단보강철근비에 미치는 영향을 파악하였다. 실험에 의하면 ACI 318-08 기준식이나 AIJ-99 기준식에서 요구하는 최대 전단보강철근비보다 최대 약 1.9배까지 전단보강철근을 많이 배근하였음에도 불구하고 실험 결과는 전단보강철근이 항복한 이후에 부재가 최대 내력에 도달하였다.

Keywords

References

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  1. Maximum Shear Strength of Slender RC Beams with Rectangular Cross Sections vol.141, pp.7, 2015, https://doi.org/10.1061/(ASCE)ST.1943-541X.0001156