Pb$3)-$

A fully composite floor system consists of W$1422$ beams and $4$ in thick reinf. concrete slab with effective width $b$ effective $=90in.$ The beams are spaced at $7ft-6$ in $,$ and the span length is $30$ ft $.$ Assume no lateral support during the construction phase. The superimposed loads are as follows:

Pre$-$composite $($construction stage$)$:

Construction load $=20$ psf

Concrete unit weight $=150$ pcf

Composite stage:

Partition Live load$=10$ psf

Weight of ceiling and light fixture$=5$ psf

Live load$=60$ psf

Determine whether the flexural strength is adequate at the construction $($before concrete cures$)$ and composite stages $($after the concrete cures$).$ A $992$ steel is used and $f^{\text{'}}c=4000.$