Currently, cold formed RHS members are extensively used as columns of the steel moment frames. Cold formed RHS columns are greatly influenced in their material properties by manufacturing processes, and have a possibility of brittle fracture when the local buckling is prevented. In this study, full scale shaking table test was carried out for cold formed RHS columns produced by different manufacturing processes, that is, roll-formed column and press formed column. The sizes of the specimens were about the same as those usually used for the medium height of buildings. From the experiment, the following results were obtained. 1) The ultimate behavior of the roll-formed column was governed by local buckling. 2) The ultimate behavior of the press-formed column was governed by brittle fracture. 3) The differences of both ultimate behaviors are ascribed to the differences of manufacturing processes.
