Hints and Discussion Thread
- Part a): One of the two members in this frame is a two-force member (forces acting at only two points on the member). The consequence of this is that the reaction forces acting on this two-force member act through a line connecting the two points at which these forces act. The benefit of recognizing this is that you know the direction of this pair of reaction forces, reducing the number of unknowns from two to one.
- Part b): Write down the three equilibrium equations from the FBD of the non-two-force member, and solve for the unknowns.
- Part c): Make a mathematical cut through member BCD, and keep one side of the member from this cut. This cut will expose three internal resultants: an axial force component, a shear force component and a bending moment. Solve the equilibrium equations for the internal resultants.
Any questions? Ask (and answer) questions here.