Trouble analysing simple pin jointed problem

[FreeBodyDiag]

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

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

Thanks for any feedback.

FBD

 

[Navin A S]

of the system should be done, and equations of equilibrium formulated. Then solve for the reaction forces at A and B. By considering the element PBL by itself, you can find the reaction force at P. Also have a look at the FBD of each individual pin. This will help you to see if all forces are balanced or not. If you are still having trouble, it may be useful to post the equations you have set up so far and the results you got from WorkingModel 2D.