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Axially Loaded Members Question

  1. Oct 2, 2011 #1
    1. The problem statement, all variables and given/known data

    dfdjcj.jpg

    So I'm trying to do this problem right now. For the most part, I feel like I have 80% of the work done (in terms of finding certain unknowns etc) but I have no idea how to incorporate the θ=3°. What I mean is, what kind of equation can I set up that includes the angle in it? Apparently you don't need trig or anything, so I am a bit lost.

    2. Relevant equations

    ƩMb = 0; FA(a) + FD(b) - P(c) = 0
    F = kΔ
    ΔD/b = ΔA/a (I used similar triangles to achieve this for when the bar will be pulled down)

    3. The attempt at a solution

    At the moment, I have found all the unknowns such as the reaction and spring forces etc. I think I am on the right track, but I just have no idea how I can set up an equation using the maximum angle.

    Thank you for your help!
     
  2. jcsd
  3. Oct 2, 2011 #2

    nvn

    User Avatar
    Science Advisor
    Homework Helper

    Hint 1: sin(3 deg) = delta_A/a; but delta_A = F_A/k1.
     
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