Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Structural Performance of Beam-Column Connections Using 51 mm Diameter with Different Anchorage Details

51 mm 대구경 철근을 사용한 외부 보-기둥 접합부의 정착상세별 구조성능 평가

  • Kim, Jung-Yeob (Dept of Architectural Engineering, Hanyang University) ;
  • Jung, Hyung-Suk (Dept. of Architectural Engineering, Catholic Kwandong University) ;
  • Chun, Sung-Chul (Division of Architectural and Urban design, Incheon National University) ;
  • Kim, In-Ho (R&D Center, Posco E&C) ;
  • Choi, Chang-Sik (Dept of Architectural Engineering, Hanyang University)
  • 김정엽 (한양대학교 건축공학부) ;
  • 정형석 (가톨릭관동대학교 건축공학과) ;
  • 천성철 (인천대학교 도시건축학부) ;
  • 김인호 (포스코건설 기술연구소) ;
  • 최창식 (한양대학교 건축공학부)
  • Received : 2016.12.28
  • Accepted : 2017.03.08
  • Published : 2017.04.30
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Abstract

In exterior beam-column joints, hooked bars are used for anchorage, but usage of high-strength and large-diameter bars increases, headed bar is preferred for solving steel congestion and difficulty in construction. To investigate the structural performance of headed bars, Six exterior beam-column joints were tested under cyclic loading. Tests parameter were the anchorage methods and concrete strength. The test results indicate that behavior of headed bar specimens shows similar performance with hooked bar specimens. All specimens failed by flexural failure of the beam. Headed bar specimens shows better performance in anchorage and joint shear. All specimens were satisfied the criteria of ACI374.1-05. Test results indicate that use of headed bar in exterior beam column joint is available.

외부 보-기둥 접합부에서는 철근정착을 위해 갈고리철근 사용하고 있으며, 철근과밀배근 해소와 시공작업의 어려움으로 확대머리철근의 사용이 증가하고 있다. SD600 51 mm 확대머리철근을 사용할 경우 ACI318-14 및 KCI2012기준에서 사용을 제한하고 있다. 이번 연구에서는 외부 보-기둥 접합부 내에 고강도 대구경 철근의 확대머리 철근의 사용이 가능하도록 실험 60 MPa, 80 MPa 콘크리트강도로 제작된 실험체의 정착상세별 구조성능을 평가하였다. 모든 실험체에서는 보의 휨항복파괴가 발생하였으며, 실험체의 모멘트-변위 곡선에서 비슷한 양상을 보였다. 다른 실험체보다 갈고리가 한쪽방향으로 배근한 실험체에서는 갈고리철근 배근방향에 의해 전단저항능력이 달라지므로 3.5%변위비 이후에 부착응력 감소가 더 크게 나타났으며, 전단변형능력도 더 크게 나타났다. 실험체의 내진성능을 확인하기 위하여 ACI374.1-05기준과 비교하였으며, 실험결과 충분한 내진성능을 확보하였다. 이를 통하여 외부 보-기둥 접합부에서 SD600, 51 mm 확대머리철근의 사용이 가능한 것으로 판단된다.

Keywords

References

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