Problem $2$: Truss Influence Lines

A bridge is composed of two trusses whose configuration is shown below. The trusses are loaded at their top chord panel points by the reactions from a stringer and floor$-$beam system that supports the roadway. Draw the influence line for force in bars FE and CF$.$

Assume the truck moves along the center of the roadway so that one$-$half of the truck load is carried by each truss. Using your influence line, determine and report the maximum live load force in member CF$,$ both positive $(T)$ and negative $($C$),$ that can be produced by the truck as it traverses the bridge, taking into consideration that trucks can travel in either direction.

NOTE: $AB,BC,CD,FG,$ and $EF$ are all $6m$ in length