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Title |
Ultimate Resisting Capacity of Axially Loaded Circular Concrete-Filled Steel Tube Columns
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Keywords |
CFT 기둥 ; 콘크리트 구속효과 ; 강관의 2축 항복 ; 최대 저항능력 CFT column ; confinement effect of concrete ; bi-axial yield of steel tube ; ultimate resisting capacity |
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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.
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