The $18-$story building given in Problem $2$ must support a floor and roof dead load of $80$ psf$,$ a floor live

load of $50$ psf$,$ and a roof live load of $30$ psf as given in Problem $2.$ The building has a uniform story

heights of $14$ ft$.$ The wind load is determined to be $40$ psf over the upper $50$ ft$,$ and the lateral load is to be

resisted in each direction by perimeter moment frames. The $4-$bay moment frames are located on grid lines

$1$ and $8$ and the $7-$bay moment frames are located along lines A and E$.$ Use the load case that includes

dead, live and wind loads to calculate resultant wind forces in each frame at the roof level and at the next

level down for design by LRFD$.$