Draw the influence lines for forces in bars AL and KJ in Figure P12.39. Using the influenc...

Draw the influence lines for forces in bars AL and KJ in Figure P12.39. Using the influence lines, determine the maximum live load force (consider both tension and compression) produced by the 54-kip truck as it transverses the bridge, which consists of two trusses. Assume the truck moves along the center of the roadway so that one-half of the truck load is carried by each truss. Assume the truck can travel in either direction.

Figure P12.39: