Draw the influence lines for forces in bars (A L) and (K J) in Figure P12.39. Using

Question:

Draw the influence lines for forces in bars $A L$ and $K J$ 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.

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