I learnt the "Method of Joints" during last lab which is s a way to find unknown forces in a truss structure. This method also would be used in completion of the A-3 assignment.The method of joints consists of satisfying the equilibrium equations for forces acting on each joint. In the lab, we also discussed some ideas of our next three foot span bridge. We agreed that we would use the new method we learnt to calculate our new design to get the most serviceable design.
After the amounts of calculating, I think this method of analysis, the "Method of Joints," is not sufficient for a real bridge for some reasons. First, a real bridge should be tested and analyzed in many more ways than just testing a downward force on a connection joint. Even this method shows the tension and suspension of every members, a real bridge could not be built of this simple databases. Secondly, A real bridge is not only hold its own weight but also deals with dynamic loads and the things like side pushing from the side and even up drafts from underneath. "Method of Joints" does not show that side.
I am not saying that the "Method of Joints" is completely useless because it at least shows the force when a truss bridge is under a special circumstance, which is in equilibrium. If a truss is in equilibrium, then each of its joints must be in equilibrium. That's how this method works. This method is one of many methods that are used to analyze bridges. Of course there should have more different calculation for a real bridge.
There's one thing I'd like to further analyze, which is the accurate breaking point of the K'Nex gussets when they are experiencing forces. I think that this information would be useful at our next assignment, which is designing a three foot span bridge.
For next week, we will working on our new bridge and complete the comp2.
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