Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Ultimate Resisting Capacity of Axially Loaded Circular Concrete-Filled Steel Tube Columns

축력이 재하된 원형 콘크리트 충전강관 기둥의 최대 저항능력

  • Kwak, Hyo-Gyoung (Dept. Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kwak, Ji-Hyun (Dept. Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
  • 곽효경 (한국과학기술원 건설 및 환경공학과) ;
  • 곽지현 (한국과학기술원 건설 및 환경공학과)
  • Received : 2012.02.23
  • Accepted : 2012.06.26
  • Published : 2012.08.31
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Abstract

The axial load on the concrete-filled steel tube (CFT) column produces confinement stress, which enhances strength of the core concrete. The amount of strength increase in concrete depends on the magnitude of produced confinement stress. From nonlinear analyses, the ultimate resisting capacity of the CFT columns subjected to axial loads was calculated. Nonlinear material properties such as Poisson's ratio and stress-strain relation were considered in the suggested model, and the maximum confining stress was obtained by multi axial yield criteria of the steel tube. This proposed model was verified by comparing the analytical results with experimental results. Then, regression analyses were conducted to predict the maximum confining stress according to D/t ratio and material properties without rigorous structural analysis. To ensure the validity of the suggested regression formula, various empirical formulas and Eurocode4 design code were compared.

콘크리트 충전 강관 기둥은 축하중 재하시 콘크리트에 구속응력이 발생함에 따라 콘크리트의 강도가 증가한다. 콘크리트의 강도 증가분은 발생된 구속응력의 크기에 종속되므로 비선형 해석을 통하여 원형 콘크리트 충전 강관의 축방향 하중에 대한 최대 저항능력을 산정하였다. 콘크리트의 포아송비 및 응력-변형률 관계와 같은 비선형 재료 특성을 고려하였으며, 강관의 다축 항복조건을 기준으로 최대 구속응력을 산정하였다. 실험 결과와의 비교를 통하여 제안된 모델을 검증하였으며, 회귀분석을 통하여 D/t 비율 및 재료성질에 따른 최대 구속응력 산정법을 단순화하였다. Eurocode 4 설계 기준 및 기존에 제안된 다양한 경험식과의 비교를 통하여 제안된 회귀분석식의 타당성을 검증하였다.

Keywords

References

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