1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Cantilever, pin and UDL confusion

  1. Sep 30, 2012 #1
    So I have a 10 metre cantilever with a pin in the middle
    There is a roller at the end and a UDL of 10 kN / m acting across.
    Drawing the BMD is confusing me.

    By my calculations; there should be a 50 kN load acting at the fixed end and roller.
    Hence shape of the shear force diagram would be up, negative gradient and then up again.
    But this would make it impossible for the BMD to equal zero at the pin.

    Moreover when I split the cantilever at the pin, I find that the support reactions equal 25 kN now....

    Where am I going wrong?
  2. jcsd
  3. Sep 30, 2012 #2

    One cantilever or two or what?
  4. Sep 30, 2012 #3
    one cantilever
  5. Sep 30, 2012 #4


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    I think you mean that the beam is fixed at one end, then there is a pin at 5 m which connects another 5 m long beam that is roller supported at its other end?
  6. Sep 30, 2012 #5
    Question says: A propped cantilever beam ABC with a pin at B experiences a UDL of 10 kN/m.
  7. Sep 30, 2012 #6
    dont worry figured it out :D
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook