03.2 Statically indeterminate axially loaded members

[@johnrexsalcedo]

Hello . I don't understand in the first example, why u only had one reaction in your FBD on a fixed support reaction?

[@fir_daus0066]

I confuse why we need to ingnore that 20kn in the equation that after the force method

[@adelmahmoud1295]

What really confuses me is that I don’t know which segment is the force P acting on. In some problems, L is the distance behind the arrow which in this problem is 400mm and in some problems L is the distance in front of the arrow which I’m this problem is 800mm. Could you please explain this to me ?

[@introductoryengineeringmec9114]

You can determine the segment the force acts on by inspecting the free body diagram. The load must transfer through the structure from the point of force application to the structure's support. (The path the force takes through the structure is called the “load path”.) When using the force method, there is only one support on the structure, so, the segment that "feels" the load is the segment between the support and the point where the load is applied.