Truss calculator: method of joints
Choose a truss, move the load or spread it across the deck, and every member's force is solved by the method of joints: blue for tension, red for compression, thickness by size.
Works in metric or imperial units.
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Questions students ask
What is the method of joints?
Each joint of a pin-jointed truss is in equilibrium, so the forces in the members meeting there, plus any load or reaction, add to zero in both directions. Solving joint by joint gives every member force.
How do you know if a truss is statically determinate?
Members plus reactions equals twice the number of joints (m + r = 2j) for a stable plane truss.
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