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Homework Help: Load on a beam: More unknowns than equations?

  1. Aug 2, 2015 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations
    FBD and all forces and moments = 0

    3. The attempt at a solution
    Sketched in the image.

    So, I don't know how to go on with my analysis of the load, since I can't determine the reaction forces. Can someone please help me? Thanks in advance!

    Attached Files:

  2. jcsd
  3. Aug 2, 2015 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    This beam is what is known as a "propped cantilever". It is statically indeterminate.

    You will have to write additional equations, knowing that the deflection = 0 at B and the deflection and slope of the beam at A are both equal to zero.
  4. Aug 17, 2015 #3
    There seems to be a hinge between A and B. This makes it statically determinate. At the hinge, the bending moment would be zero, and this gives you the additional equation you need to solve the problem.
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