Problem $1$:

A compound beam as shown with a pin at A $,$ a hinge at C $,$ and rollers at B and D $,$

Draw all F$.$B$.$D$.$s for your calculation;

Determine the reactions at $A,B$ and D when the beam is in equlibrium.

Hint: $1)$ ABC part is the independent part and $CD$ is the dependent part of the compound beam. The analysis always starts from the dependent part, then the independent part. $2)$ Draw the FBD of $CD$ part first.