Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Structural Performance of High-Strength Concrete-Filled Steel Tube Steel Columns using Different Strength Steels

이종강종을 사용한 고강도 CFT 합성부재의 구조성능

  • Choi, In Rak (Steel Structure Research Div., Research Institute of Industrial Science & Technology) ;
  • Chung, Kyung Soo (Steel Structure Research Div., Research Institute of Industrial Science & Technology) ;
  • Kim, Jin Ho (Steel Structure Research Div., Research Institute of Industrial Science & Technology) ;
  • Hong, Geon Ho (Dept. of Architectural Engineering, Hoseo University)
  • 최인락 (포항산업과학연구원, 강구조연구소) ;
  • 정경수 (포항산업과학연구원, 강구조연구소) ;
  • 김진호 (포항산업과학연구원, 강구조연구소) ;
  • 홍건호 (호서대학교, 건축공학과)
  • Received : 2012.08.13
  • Accepted : 2012.12.07
  • Published : 2012.12.27
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Abstract

Structural tests were performed to investigate the structural performance of concrete-filled steel tube column using different strength steels in their flange and web with high-strength steel HSA800 and mild steel SM490, respectively. The test parameters included the strength of column flange and infill concrete, and effect of concrete infill. Connection between different grade steels were welded using the electrode appropriate for mild steel and verified its performance. To evaluate the behavior of test specimens, eccentric loading tests were performed and the results were compared with the prediction by current design codes. Axial load and moment carrying capacity of test specimens increased with the yield strength of compression flange and weld fracture occurred after the specimen shows full strength. The prediction result for axial load-bending moment relationship and effective flexural stiffness gave good agreement with the test result.

플랜지와 웨브에 서로 강도가 다른 이종강재를 사용한 CFT 합성구조의 거동특성을 파악하기 위하여, 플랜지는 건축용 800MPa급 강재인 HSA800, 웨브에는 일반강도 강재인 SM490 강재를 사용하여 실험연구를 수행하였다. 주요실험 변수는 강관의 강도 조합, 충전된 콘크리트의 강도, 콘크리트 충전효과이다. 이종강재간의 용접접합부는 낮은강도 강재에 적합한 용접부를 사용하여 접합부 성능을 검증하였다. 실험체의 거동특성을 평가하기 위해 편심압축 실험을 수행하였으며, 현행 설계기준들에 따른 예측결과와 비교하였다. 플랜지에 고강도 강재를 적용함에 따라 단면의 축강도 및 휨모멘트강도가 증가하였으며, 부재 강도를 충분히 발현한 이후 용접부에서 파괴가 일어났다. 실험결과 현행 설계기준을 적용하여 합성단면의 축력-모멘트 상관관계 및 유효휨강성을 안전측으로 예측 가능하였다.

Keywords

References

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