Problem $2$

$($Problem $11\mathrm{.}5,$ Textbook modified$)$

A floor system supporting a $6$ in$.$ concrete slab is shown in Figure P$11\mathrm{.}4.$ The live load is $100$ psf $.$ Using LRFD$,$ select the most economical sections for:

The typical beam of A$992$ steel.

The typical girder of A$992$ steel.

The concrete floor provide full lateral support for the compression flange for both the beams and the girders.