Beam formulation Plaxis and Geostudio

[southsoniks]

[/i]Hello!
I was wondering does anyone knows which type of beam formulation (Euler - Bernoulli or Timoshenko) does Plaxis and Geostudio uses. I tried to find out throughout manuals but there isn't any clue.
Thanks
Best regards

[southsoniks]

I find out that Geostudio uses Euler-Bernoulli beam formulation, while Plaxis uses Timoshenko beam formulation.
Hope someone else than me finds this useful.
s

[freequo]

Southosniks, I'm not so sure that Plaxis uses Timoshenko beam formulation. From where did you obtain that information.

[ynopum]

Mindlin's beam theory, actually!

[dixz_on]

Mindlin's beam theory, actually!

i think that Mindilin's is for plate (thick plate), just like Kirchove Love for thin plate..

[ynopum]

Yes. The program is plane strain, and what we say that is beam represents a plate (1 m strip of it). It is written in the manual.

It is always a good idea before asking something for any program to check its documentation.

But it seems that the starter of this thread is banned for some reason, so answering was useless.

[freequo]

I wouldn't say that is useless. I'm also researching beam formulation for FE analysis.
Unlike southsoniks,maybe, I did take a look in Plaxis manual, but there is no word about formulation, only test functions.

[ynopum]

Take another look in the manual :dash2: :

[southsoniks]

Ok. I see that I missread something. Btw, If you use Mindlin theory with width of beam 1m, it transforms to Timoshenko theory.

[ynopum]

I am curious why think that the beam formulation is important, especially in ground-engineering. Usually in this field have huge error in the input data; then the geometry is not precise; then the material behavior laws are far from the reality (elasticity theory, small displacements !!), and finally the FEM errors itself. Maybe your interest is just for some theoretical comparison.