Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Evaluation of the Maximum Yield Strength of Steel Stirrups and Shear Behavior of RC Beams

철근콘크리트 보의 전단보강철근의 최대 항복강도 및 전단거동 평가

  • Lee, Jung-Yoon (Dept. of Civil, Architectural, and Environmental System Engineering, Sungkyunkwan University) ;
  • Choi, Im-Jun (Doosan Heavy Industries & Construction) ;
  • Kang, Ji-Eun (Dept. of Civil, Architectural, and Environmental System Engineering, Sungkyunkwan University)
  • 이정윤 (성균관대학교 건설환경시스템공학과) ;
  • 최임준 (두산중공업 건설기술팀) ;
  • 강지은 (성균관대학교 건설환경시스템공학과)
  • Received : 2010.05.24
  • Accepted : 2010.07.13
  • Published : 2010.10.31
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Abstract

The requirement of the maximum yield strength of shear reinforcement in the KCI-07 code is quite different to those in the ACI-08 code, EC2-02, CSA-04, and JSCE-04 codes. Eighteen RC beams having high strength shear reinforcement were tested. Test results indicated that even if the yield strength of shear reinforcement in beams was much greater than the maximum yield strength required by the KCI-07 design code, the shear reinforcement of these beams reached their yield strains. Furthermore, the shear strengths of tested beams increased almost linearly with the increase of the amount of shear reinforcement. In addition, larger numbers of diagonal cracks developed in the web of the beam having greater yield strength than the beams having lower yield strength of shear reinforcement. The maximum crack width of the beam having high strength shear reinforcement was approximately the same to the crack with of the beam having normal strength shear reinforcement.

콘크리트구조설계기준(2007)에서 제한하는 전단보강철근의 최대 항복강도와 ACI 318-08 기준식, EC2-02 기준식, CSA-04 기준식, JSCE-04 기준식에서 요구하는 전단보강철근의 최대 항복강도에는 많은 차이가 있다. 이 연구에서는 18개의 철근콘크리트 보 실험을 통하여 전단보강철근의 항복강도와 콘크리트의 압축강도가 부재의 전단거동에 미치는 영향을 파악하였다. 실험에 의하면 콘크리트구조설계기준(2007)에서 요구하는 전단보강철근의 최대 항복강도보다 최대 약 1.88배까지의 고강도 전단보강철근을 배근하였음에도 불구하고 실험결과는 전단보강철근이 항복한 이후에 부재가 최대 내력에 도달하였다. 또한 모든 실험체의 전단 내력은 전단보강철근의 양이 증가함에 따라서 거의 선형적으로 증가하였다. 사인장균열에 대해서는 전단보강철근의 항복강도가 증가함에 따라서 균열의 수가 증가하였고, 동일한 하중비에 대하여 보통강도 전단보강철근을 사용한 보의 사인장균열 폭과 고강도 전단보강철근을 사용한 보의 사인장균열 폭은 거의 유사하였다.

Keywords

References

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  1. Evaluation on the Maximum Yield Strength of Steel Stirrups in Reinforced Concrete Beams vol.24, pp.6, 2012, https://doi.org/10.4334/JKCI.2012.24.6.685