A column of hollow rectangular cross-section and made of steel plates is shown in Fig. 23.13. The thickness of the section is 2.5 mm throughout. The plate material is steel 30C8 \left(S_{y t}=\right. \left.400 N / mm ^{2} \text { and } E=207000 N / mm ^{2}\right) . The end fixity coefficients can be taken as 1.5 and 1 for bending about long and short axes respectively. The effective length of the column is 1 m. Determine the load capacity of the column from buckling consideration.