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A box section of length L = 6 m and cross-sectional dimensions of a = 54mm,...

A box section of length L = 6 m and cross-sectional dimensions of a = 54mm, b = 32 mm has wall thickness t = 3 mm. This box section is used as a part of structure, and it is subject to a load along its longitudinal axis. The K factor for the end conditions of the column is 0.25 . Calculate the buckling load of the column, which is made of a material with an elastic modulus of E = 128 GPa.  

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