In Japan, square steel tubular columns have been widely used and seismic loads are significant in designing a column. However, the present design formulas for columns are based on test results of H-shaped steel columns, and it is questionable that this formula can be directly applied in square tubular columns. Moreover, test data that will verify the current limitation for square steel tubular column does not exist. Therefore, it is necessary to clarify the deformation capacity of square steel tubular columns under constant axial force with bending moment. For this purpose, full scale testing of square steel tubular columns are conducted. From the test results, the effects of axial force ratio, material property and loading pattern on the elasto-plastic behavior of the columns are clarified. And, it is shown that P-δ moment significantly decreases the plastic deformation capacity of the columns.
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