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Trouble analysing simple pin jointed problem

  1. Oct 29, 2011 #1
    Hello

    I feel like I am overlooking some fundamentals when I am trying to solve/set up the equations to solve the following pin jointed problem. The only load on the system is at L. I ultimately need to solve all the reactions on the pins at A, B and the link at P (though I believe what is happening at P can be ignored when solving the forces at A and B).

    I am concerned about getting the signage right on my terms (+ or -) as well as simplifying some of the reaction forces at the pins. I also am getting confused when I try to reconcile and approach the problem by considering the element PBL by itself in a free body diagram.

    [PLAIN]http://img835.imageshack.us/img835/8058/problemfv.jpg [Broken]

    To make things more confusing I tried setting this problem up using WorkingModel 2D to try an set me straight but for some reason the answer I got from it just doesn't make sense. The reaction forces in the x direction don't see to add up to zero. Maybe I set up the problem incorrectly in the software?

    [PLAIN]http://img24.imageshack.us/img24/7528/forces.jpg [Broken]

    Thanks for any feedback.

    FBD
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
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