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Homework Help: Support reactions, castigliano's second.

  1. Dec 2, 2009 #1
    1. The problem statement, all variables and given/known data

    Determine the support reactions for the given structure(see attachment) due to flexural deformations using castigliano's second theorem. Axial deformations are considered negilible.

    2. Relevant equations

    delta = dU / dP

    3. The attempt at a solution

    See attachment. I could use some advice on how to continue. Thanks.

    Attached Files:

    Last edited: Dec 2, 2009
  2. jcsd
  3. Dec 2, 2009 #2
    in such questions u don't have to differentiate with respect to force...do it with respect to displacement...n then by using relations replace it with the support reactions..
  4. Dec 15, 2009 #3
    It would help if you didn't assume that the Right hand reaction was P/2. It is less than that because the encastre support at A attracts load to it, this being a statically indeterminate structure. Have you obtained all the reactions and checked external equilibrium before starting all those integrals?
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