The ultimate flexural strength of concrete-filled steel tubular (CFT) columns is improved by using high-strength materials. The current design formula of CFT columns excludes high strength materials. CFT columns that used in buildings are generally subjected to bending and shear force, but this formula was verified by uniform bending tests. In this paper, it was attempted to formulate the ultimate flexural strength and limit displacement of CFT columns by organizing previous experiments that CFT columns were subjected to bending and shear force.
