Abstract
In AIJ design formula for composite steel tube and concrete structures, the limiting width (diameter)-to-thickness ratio of steel tube is relieved to 1.5 times that for a hollow tube. In this paper, it is investigated whether the limiting value for concrete-encased type section is appropriate or not. As the experimental parameters, shape of steel tube, section type and width (diameter)-to-thickness ratio are selected. Total thirty-four stub column specimens are tested under concentric load. From the view point of the maximum strength, current limiting width (diameter)-to-thickness ratio is practically appropriate.
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