Fig. P$1($a$)$ shows the schematic diagram of a truck as per AASHTO design code. Take the distance marked Varies as $30$ feet.

Now consider that the truck is moving $($forward as shown in Fig. P$1($a$))$ from F to A on a bridge that is modeled as a beam shown in Fig. P$1($b$)$ with a pin support at A$,$ a roller supports at B$,$ E$,$ and F$,$ and member $CD$ with internal hinges at $C$ and at $D.$ Assume that the axle loads are applied as static loading on the beam $($no dynamic effects$).$

Compute and plot the reaction at A and reaction at $E$ as a function of the distance of the front axle of the truck with respect to F$.$ Use the Load Cases feature in the GS$-$USA $$ Program to solve this problem using a single model.