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2D Frames are typically two members connected at a pin, where one of the members is a two-force member. The other member is loaded such that it is not a two-force member, and is usually connected, like the two-force member, to the surroundings by a pin connection.
Solving these kinds of problems first involves noting that there is a two-force member, then drawing the free-body diagram of the other member. It typically will have 2 unknown reactions plus the unknown force from the two-force member. Apply the equations of equilibrium to give 3 equations in 3 unknowns. Many times only the force in the two-force member is required, so a single moment equation will yield the required value. The key is noting that one of the members is a two-force member. – Dr. Tom
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