A proposed column, $6m$ long, in a frame is required $-$ it is restrained against buckling only at its ends. For the strength limit state, select the minimum mass I section $($UC$),$ Grade $300$PLUS, from the OneSteel catalogue that will safely carry given concentric nominal axial compression load of $800KN.$ The end restraints at both ends of the column are as follows:

For the $x-$x axis, the column is a sway member with a rotation free$-$translation fixed base and a rotation fixed$-$translation free top.

For the $y-$y axis, the column is a braced me with a rotation fixed$-$translation fixed base and top as shown in the figure below.

Find: Determine the uniform bending design moment resistances when the flange is in either compression or tension.