The cylindrical tubular steel members are widely used as the column members in the steel structures. There are lots of studies on the buckling strength of steel tubular column and the design formulas are proposed. But there are few studies onthe perforated members or the tubular column with variable thickness. It is possible to occur the deterioration of strength owing to the decreasing of cross-section, the stress concentration around hole and the interactive behavior of both. In this report, the buckling strength of the perforated cylindrical tubular column is tested and the influence of the hole on the deterioration of buckling strength is studied.
