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How will I calculate the forces involved in a truss and suspension bridge, my teacher did not explain this fully and I'm confused as hell.
Depends on the geometry and the loads applied to your bridge. If would be great if you posted a pic.Alpha[X]²;1286900 said:How will I calculate the forces involved in a truss and suspension bridge, my teacher did not explain this fully and I'm confused as hell.
Which calculations? Do you mean, the calculation of the reaction forces at the supports?Alpha[X]²;1288812 said:How did it come up with those calculations though?
I assume the numbers represent the forces in the members, and the colors represent compression/tension. As I said, you can calculate every force by looking at every node separately. Imagine you "cut out" the leftmost node. You have two unknown and forces and one familiar force. Set up two equations of equilibrium, one for the "y-direction", and one for the "x-direction". You can calculate the forces in the members from these equations.Alpha[X]²;1288819 said:Yes, the numbers on the members in the diagram.
Of course, for some reason, I totally ignored the mesh. :uhh:The triangles are not equilateral in the drawing.
The answers are correct (to 2sf) for the shape as it is drawn. I get 30.05 for the force in the leftmost blue truss.