Abstract
A lot of study has been executed on the bending-shear force bearing capacity and flexural deformation capability of concrete filled steel tube (CFT). Especially, the confined effect to the in-filled concrete by the steel tube has been the main theme to be estimated exactly. But in case of the CFT in which high compressive strength concrete such as 1 000 kg/cm2 is used, the contribution of the confined effect to the ultimate bending strength has not yet been estimated numerically. In this study, we did the experimental researches to investigate the flexural strength and flexural deformation capability of a CFT which has square hollow section tube and 1 000 kg/cm2 compressive strength filled concrete. The CFT is completed by using centrifugal compaction and autoclaved curing. The experimental process, results and observations are reported in the paper.
