1. Draw the influence lines for RA and the bar forces in members AD, EF, EM, and NM. Loads are transmitted into the truss through the lower chord panel points. Vertical members EN and GL are 18-ft long, FM is 16 ft.
2. (a) Draw the influence lines for the bar forces in members HC, HG, and CD of the truss shown in Figure P12.32. The load moves along the bottom chord of the truss. (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.