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Methods of Section: Truss problem

  1. Sep 22, 2015 #1
    1. The problem statement,
    Have to find the forces in AC & BC using the methods of section.

    all variables and given/known data

    Distance
    AB = 79cm
    BC = 63
    AC = 98
    d = 3.833
    AZ = 62.881
    ZC = 75.16

    Point B is a roller and point A is a Pin

    Whats given is 39.94N Forces @ C going down

    2. Relevant equations
    ΣFx
    ΣFy
    ΣMa

    3. The attempt at a solution


    upload_2015-9-22_22-33-8.png
     

    Attached Files:

  2. jcsd
  3. Sep 23, 2015 #2
    You appear to have cut through BC and AC, and are analyzing the part with point C.
    Your reaction forces at the wall appear to be correct.
    I suggest analyzing the part next to the wall.
     
  4. Sep 24, 2015 #3
    If I take moment at point A does Bx cancel ?
    BC I calculated is correct?
     
  5. Sep 24, 2015 #4
    You have BC=Bx, which cannot be. If I read your drawing right, Bx=31.79 (I agree) and taking the moments around A of the section next to the wall tells you this must cancel the horizontal component of BC.
     
  6. Sep 27, 2015 #5
    I got the answer. I didn't understand the concept first. After reading I got it :D
     
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