ABSTRACT
Concrete-filled steel tubular (CFT) columns are being more widely used in the construction of high-rise buildings, bridges, subway platforms, and barriers. Their usage provides excellent static and earthquakeresistant properties, such as high strength, high ductility, high stiffness, and large energy-absorption capacity. CFT columns provide the benefits of both steel and concrete: a steel tube surrounding a concrete column not only assists in carrying axial load but also confines to the concrete. Furthermore, it eliminates the permanent formwork, which reduces construction time, while the concrete core takes the axial load and prevents or delays local buckling of the steel tube.
