One reason I dont get why this works is because of P2, I can not visualize this moment.ĭoes anyone see my problem? I have borrowed alot of books and looked up texts on the internet, but most of them are just explaining how to set up the equations etc. Of course the joint have to be in equilibrium but I dont see the connection in all of this, I mean I dont see why when you use this fact you get the right answer. Now, all the textbooks says that P1 and P2 added toghether at each joint from all sides(at the figure I displayed these are moments for instane) have to be zero because of equlibrium of the joint. Then we let the structure rotate at it ends and the forces that develop at the ends then because of displacement is called lets say P2. Let's call these forces/moments that develop at the ends for P1. The stiffness method says that first we consider that the structure can not rotate, so we get the forces in the structure caused by the external loads if the structure could not rotate in the ends. This is a beam that at the endpoints and in the middle only can be diplaced by rotation so this makes the problem easier. In my question I will use a very simple structure, consider this beam(disregard the forces) dia.org/wikipedia/co mmons/b/b9/Staticall y_indeterminate_beam. My question is about why this method works. I am not asking you to help me solve a problem, I have done a lot of problems and can manage that, but inspite doing a lot of problems I still don't understand why the method works. Hello!, I have a question about the stiffness method in structural analysis.
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