How to simulate a beam fixed on both side with central force ?

Questions
1

Hi everyone,

I would like to simulate the deformation of a beam which is fixed on both ends and has a central force applied to it.
I have been inspired by this Mathematica example:

plainstrainoperator.jpg
plainstrainoperator.jpg1563×476 162 KB

I have understood the plane stress operator that is defiined in the beginning. If you want to have a look, how it is constructed I included a PDF where I try to explain that. Now, I would like to change my boundary conditions so to have a central load and to fixed ends.
How would you do that?

Thank you very much!

2

Please be careful selecting new groups, do not select unrelated groups.

Please paste real Wolfram Language code instead of images and show what you have tried.

3

okay thank you. The code can be found when you follow the link.