Concrete-filled steel tube (CFT) structures are a kind of steel-concrete composite structure. They feature high structural performance such as high load-carrying capacity and high deformation capacity. In Japan, their application started in the latter part of the 1950s, and CTT structures have widely been used in the construction of a number of high-rise office buildings. The first study report of CFT structures submitted in Japan was the "Experiment and analytical study on buckling loads of CFT compressive members" prepared by Prof. Shizuo Ban and others in 1956. Then in 1961, a similar report was submitted: "Experiment and analytical study on the centri-cally loaded CFT slender columns" by Prof. Takeo Naka, Prof. Ben Kato and others.
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