(a) Draw the influence lines for the bar forces  in members HC, HG, and CD of the truss sh...

(a) Draw the influence lines for the bar forces  in members HC, HG, and CD of the truss shown in Figure P8.32. The load moves along the bottom chord of the trass. (b) Compute the force in member HC if panel points B, C, and D are each loaded by a concentrated vertical load of 12 kips.