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A simply supported beam has 2 equal point loads (W/2)

  1. Feb 16, 2007 #1
    I have a simply supported beam 1.2m long
    it has 2 = point loads (W/2) at equal distances (0.4m) along the beam
    i have been asked to derive from first principles the expression for the mid span defelction.
    I have got so far m= W/2x - W/2(x-L3) - W/2(x-L/6)
    and i think the answer i'm looking for is something like 23WL 3 / 1296EI

    can anyone help!
  2. jcsd
  3. Feb 16, 2007 #2


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    Homework Helper

    You can either use the equation w''(x) = M(x) / EI , or a dummy force method (which I personally prefer more).
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