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Trusses, method of sections

  1. Jul 15, 2015 #1
    1. The problem statement, all variables and given/known data
    Determine the forces in members BC and CG. The forces are positive if in tension, negative if in compression.
    20150715_190800_zpseupbftpt.jpg
    2. Relevant equations
    ΣF=0
    ΣM=0

    3. The attempt at a solution
    20150715_190729_zpszsi20agz.jpg
    im not sure what im doing wrong here, i think it might be my angle θ?
    I got 3.66N tension as my answer but its wrong, i just started trusses and not sure what im doing wrong.
     
    Last edited: Jul 15, 2015
  2. jcsd
  3. Jul 15, 2015 #2
    Im working on a similar problem and am making the same mistake, maybe CH needs to be found? but i think its a zero force member.
     
  4. Jul 15, 2015 #3

    SteamKing

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    Your calculations appear to state that Ay = Fy = 14 (kN?)

    The structure is not loaded symmetrically, so these reactions are incorrect.
     
  5. Jul 15, 2015 #4
    thank you sir.
     
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