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Two subjects, each a course in order. The first is the diagram: what it is and how to draw one. The second is what happens to the structure afterwards — the method the analysis tool solves it by.
6 guides
Open Free body diagrams
What a free body diagram is, how to draw one, the forces and supports that belong on it, and how to turn it into equations.
6 guides
Open The direct stiffness method
How a structure is actually solved: member stiffness, the change of axes, loads between the joints, assembly, and the calculation from end to end.