1) The study examines the mechanical behavior of hollow square steel columns with both plane and corrugated sides, with and without perforations. 2) Three types of columns were tested: columns with plane and corrugated sides (Type I), columns with perforations on the plane sides (Type II), and Type II columns with additional trapezoidal stiffeners (Type III). 3) Results found that Type II columns had a 7% reduction in load capacity compared to Type I due to the perforations. Type III columns with stiffeners had a 28% higher load capacity than Type I columns.