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Homework Help: Find the reactions the pin A and roller D exert on the truss

  1. Feb 25, 2013 #1
    1. The problem statement, all variables and given/known data
    The rigid truss supports the loads shown. Find the reactions the pin A and roller D exert on the truss.
    All concentrated loads act on the pins joining the truss members

    2. Relevant equations
    ƩMa= -5ft(3kips)-10ft(2kips)-.707(1kip)10ft+Dy(15ft)
    Dy=2.80 kips*ft

    3. The attempt at a solution
    My question is just regarding pin B. Am I supposed to assume some force is going down and to the left-45 degrees-at this location?

    Attached Files:

    Last edited: Feb 25, 2013
  2. jcsd
  3. Feb 25, 2013 #2


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    The truss members are supporting axial loads only.
  4. Feb 26, 2013 #3


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    And don't assume any loading at joint B, since there is no force applied there. Your last 2 terms in your sum of moments about A = 0 equation are also not correct.
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