Question $\backslash$# $2$: Strength of a column

Determine the compression strength of a W$18$x$76($A$992$ steel$).$

The $45-$ft long column is fixed at the bottom and free at the top.

The top of the member may move sidesway as a rigid body without rotation.

For buckling about the $"\backslash ($ y $\backslash )"$ axis, the member has additional bracings at $16$ feet, $36\mathrm{.}5$ feet.

These bracings may be considered pin supports.

You may use the AISC Manual aids to find the compression strength. Provide the number of the table$/$aids$.$

Write the number of the equations used to obtain those values. Justify the use of them.