P$3\mathrm{.}37.$ The multi$-$span girder in Figure P$3\mathrm{.}37$ has two shear plate connections that act as hinges at $C$ and $D.$ The mid$-$span girder $CD$ is simply supported on the cantilevered ends of the left and right girders. Determine the forces in the hinges and the reactions at supporis $A,B,E$ and $F.$

Extra Credit: Draw the shear and moment diagram for the beam in P$3\mathrm{.}37.$