The 2014-T6 aluminum column is \(3 \mathrm{~m}\) long and has the cross section shown. If the column is pinned at both ends and braced against the weak axis at its mid height, determine the allowable axial force \(P\) that can be safely supported by the column.

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15 mm] 170 mm -15 mm 15 mm -100 mm- -100