Abstract
In order to investigate the bearing capacity and ductility of concrete-filled square steel tubular (CFSST) with longitudinal stiffeners in condition of instant steel ratio, six specimens, including 1 CFSST, 3 CFSST with single stiffener and 2 CFSST with double stiffeners, were fabricated and tested. And the FEM was established and simulated by ANSYS. The experimental result showed that when the height-thickness ratio of stiffeners was increased, the bearing capacity would be generally decreased but the ductility could be improved. Besides, the specimens performed identical mechanical characteristics while the thickness of steel was the same. And the results of FEM were basically identical to the experiments. Finally, the confinement ξ played a key role to predict the bearing capacity.
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