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It is also well known that the load and deformation capacity of concrete-filled steel columns are considerable larger than those of widely used reinforced concrete columns and steel encased concrete columns because the concrete core in the steel is confined laterally by the steel. But, most of these works focused on columns with strength enhancement by the confinement effect, so that no local buckling prevented by the concrete. This paper presents an experimental study on the behavior of concrete-filled rectangular steel short columns using high-strength concrete under axial load. Fifteen specimens of concrete-filled circular short columns were tested under concentric compressive load. For comparsion, three specimens of rectangular steel short columns were also loaded to failure. The ultimate strength, ductility, and confinement mechansim of columns were compared. In the comparison, the effect of witch-thickness ratio, loading types and concrete compressive strength on the behavior of columns were examed. As a result, the axial load verse axial average strain relationship of concrete-filled rectangular steel columns was very stable, because of interatcions between the concrete and steel, the strength are 1% and 24% larger than the strength extimated by simply superimposed method of the concrete and steel. The axial load verse average axial strain relationship of concrete-filled rectangular steel columns was very stable. The small B/t ratios in concrete-filled rectangular steel columns aren't affected prevention of local buckling but strength enhancement by confinement effect.

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UCI(KEPA) : I410-ECN-0101-2009-540-012933471