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Question regarding Trusses

  1. Aug 6, 2015 #1
    1. The problem statement, all variables and given/known data

    u7MCJe0.png
    2. Relevant equations


    3. The attempt at a solution
    First i Found the external forces. Ax =0 , Ay = 8Kn, Jy=8Kn and P = -16Kn
    Then i took moment about point G to eliminate FH and EG and so was able to find CH = 14.66Kn.

    I am kind of stuck on how to tackle the problem further. Where should i take moment in order to find either FG or EG. Any help is appreciated. Thanks in advance!
     
  2. jcsd
  3. Aug 6, 2015 #2

    EJC

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    It's been a long time since I've done these - but if you take the moment about A, forces CH and FG will disappear, and all you will be left with is EG and P... right? I was never good at the method of sections, although it can save you a bunch of time.
     
  4. Aug 6, 2015 #3
    First, identify the zero-load members.
     
  5. Aug 6, 2015 #4
    Scratch that. You are asked for the forces in FG, EG, and CH, so cut your plane through those 3 members and sum X and Y forces and moments. You did moments to get CH, so now write the X and Y equations for your section.
     
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