A W$10$x$49$ section if used as column with unbraced fengit al $1275.$ The

steel. Is Gade $50$ and the calumin is hinged at Doth ends. Use LRFD

method to:

$($a$)$ Find the elastic buckling stress $($Fe$)$

$($b$)$ Find caf$$n efastic capacify A$)$

$($b$)$ Use Table $4-14$ provided ro find fiexural buckling stress $($Ecri

$($c$)$ Find the column inelastir fond cupacity $(P_{i2}={}^{*}$ rer $*$A$)$