$8\mathrm{.}45$ through $8\mathrm{.}52$ Draw the influence lines for the forces in the members identified by an $""$ of the trusses shown in

Figs. P$8\mathrm{.}45-$P$8\mathrm{.}52.$ Live loads are transmitted to the bottom chords of the trusses.

FIG. P$8\mathrm{.}48$