Gebt Internal Forces

  1. Salim Chaibi

    I have a problem with a 3 pts bending analysis.

    I have 29 nodes with 28 Elements.

    The Node 14 is the center of the beam. I'm applying a load of 100 N on the z-axis.
    When I'm looking for the Internal Forces for this Element, as you explained to me  I have to look in the sub Element.
    I did it but the problem is :

    if  I take the Internal Forces from the member 13 the Internal Force F3 =-50N.

    if I take the Internal Forces from the member 14 the Internal Force F3 =50N.

    But according to the beam theory the I-F F3 has to be set to 0 for my node 14.
    So taking the Internal Forces from Member  is false for me.
    What should I've to do ?
    Because I'm doing a post-processor to visualize stress and I'm blocked with this. When the computer is going to pick the Node 14 he picks also the internal Forces of Member 13 or 14.

    I join my gebt file <.dat> and <.out>

    Thank you

  2. Qi Wang

    Hi Salim, The internal shear force distribution in a 3-point bending case is as you described, opposite value on two sides of the load point, see the wiki: You need to look into the problem and decide which quantity is of interest. Qi On Fri, Nov 17, 2017 at 4:01 AM, Salim Chaibi @ cdmHUB - The Composites HUB <> wrote: ---- Emailed forum response from
  3. Wenbin Yu

    Shear force at the mid point is undefined. -----Original Message----- ---- Emailed forum response from
  4. Salim Chaibi

    So for my node in the middle of the beam where I'm applying a Force.
    I have to put the internal Shear Force F3. I have to put even the Intenal shear Force of the Left Member or Internal shear Force of the right member but i can't put 0 ?