Problem $2(20\%)$

Determine the LRFD design strength, $Pn,$ for the $28ft$

axially loaded W $1054$ column that has the bracing and end

support conditions as shown, using the AISC Specification

and $Fy=50$ksi

Show detailed calculations for the critical slenderness ratio.

Use both SC Manual Tables $4-14$ and $4-1$ a to verify your

answer.