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A lot of beam-column tests have been carried out and it was proposed that the flexural strength of concrete filled steel tubular columns (CFT) could be calculated by the strength superposing method. However, it is not verified whether the CFT section can carried such force under combined axial force and bending moment or not. Therefore, we did the eccentric compression tests on CFT short columns. The test results showed that the flexural strengths of CFT sections were terminated by the local buckling of steel tube and the maximum strengths were well estimated by using the compressive critical strain of steel tube. It was also clarified that the increase of concrete strength thanks to confinement could not be expected in case for columns with little or no moment gradient.
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FUJIMOTO et al. (1997) studied this question.
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