Abstract
The results of tests conducted on 14 concrete-filled steel tubular columns are reported. The primary test parameters were the radius and thickness of test specimens, the concrete strength, the concrete height, the position of diaphragms and the loading conditions. The local buckling were observed at the top of concretes or at the bottom of test specimens. Its position depend on the concrete height. New parameters are proposed to predict the maximum lateral load of concrete-filled steel tubular columns. The validity of the present parameters is confirmed through the present and existing experimental results. With the use of the present parameters, the optimum height of concrete filled in the columns is also proposed.
