Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Evaluation of Steel Pull-Out of Reinforced Concrete Beam-Column Joints

철근콘크리트 보-기둥 접합부 철근의 뽑힘 평가

  • Woo, Jae-Hyun (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Park, Jong-Wook (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Kim, Byoung-Il (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Lee, Jung-Yoon (Dept. of Architectural Engineering, Sungkyunkwan University)
  • 우재현 (성균관대학교 건축공학과) ;
  • 박종욱 (성균관대학교 건축공학과) ;
  • 김병일 (성균관대학교 건축공학과) ;
  • 이정윤 (성균관대학교 건축공학과)
  • Received : 2010.08.09
  • Accepted : 2010.10.22
  • Published : 2010.12.31
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Abstract

In this report, the test results of five reinforced concrete beam-column joint subjected to cyclic load are presented. The main purpose of the research is to investigate the influence of the steel pull-out of the beam-column joints to the shear and ductile capacity of the RC beam-column assembles. In addition, the influence of the amount of beam reinforcement to the joint shear and ductile capacity is evaluated. Test results indicate that the yield penetration of steel bar increases as the joint shear strength ratio, $V_{j1}/V_{jby}$ decreases. And the slippage of the steel bars are varied according to the region of the beam-column joints. The pull-out of the steel bars of five specimens was almost the same regardless of the joint shear strength ratio, $V_{j1}/V_{jby}$. Because it was affected by not only the yield penetration of steel bar but also the axial elongation in the plastic hinge.

이 연구에서는 5개의 철근콘크리트 보-기둥 접합부 실험을 분석하였다. 연구의 주목적은 접합부에 인접한 보의 소성힌지의 영향으로 인한 부착 감소로 발생하는 보 주인장철근 미끄러짐에 따른 접합부 내력 및 연성을 평가하는 것이다. 또한 보 주인장철근량을 변수로 하여 접합부 내력 및 연성에 미치는 영향을 평가하였다. 실험 결과에 의하면 접합부의 전단강도비 $V_{j1}/V_{jby}$가 감소할수록 인접한 보의 소성힌지의 변형률 침투현상은 증가하는 것으로 나타났다. 주인장철근의 미끄러짐은 구간별로 다르게 나타났으며 주인장철근 뽑힘 현상은 접합부 전단강도비 $V_{j1}/V_{jby}$와 관계없이 비슷하게 나타났다. 이것은 주인장철근 뽑힘 현상이 변형률 침투현상만이 아닌 인접한 보의 소성힌지의 축변형에도 영향을 받기 때문이다.

Keywords

References

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