$1\mathrm{.}2.$ The building in Fig. PI$\mathrm{.}1$ is used for general office space. The slab is $8$ in$.$ thick. The beams are $12$ in$.$ wide and have a total depth of $18$ in$.,$ the bay dimensions are $18\mathrm{.}5ft$ in the $x$ direction and $21ft$ in the $Y$ direction, and the superimposed service dead load is $25$ psf$.$ Calculate the factored axial column load transferred to column C$3$ on the third floor. $($Solution: $P_u=92\mathrm{.}5$ kips.$)$