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Homework Help: Moments question

  1. May 24, 2014 #1
    The question I'm attempting to do is part (a):

    http://www.picpaste.com/struc1-z7FJMCcF.jpg [Broken]

    which translates to: determine distribution of moment, The beam is elastic and has constant EI throughout its entire length. Now part of the solution looks like this:

    http://www.picpaste.com/struc2-8VGlrDU7.png [Broken]

    My question is how the moments M_A and M_C replaced with (i.e. equal to) qL^2/18 in this solution?
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. May 24, 2014 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    Welcome to PF;
    Looking at the distribution in the diagram, it certainly looks like the magnitudes of the moments about A and C should be the same (opposite directions).
    Have you tried calculating them?
  4. May 25, 2014 #3
    The cantilevered portions of the beam ends were replaced with equivalent moments Ma and Mc using simple statics.
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