The same structure, different methods of analysis, different results

2023-05-30-test.gh (46.5 KB)
Hello developer, I have encountered some problems in the process of using.
For the same structure, beam analysis and shell analysis are used, and the maximum displacement results are not consistent. (The shell is the same size as the solid beam)

Hello

I think there’s a problem with your mesh between the two brep.
By grouping them and cleaning them (with PufferFish in my case) I have removed your duplicate vertices and aligned all the faces etc…

If you would like more accurate deformation calculations, you need to increase the mesh resolution.
From a resolution of 0.05 you will find closed values:

Defining the minimum resolution to adopt is never easy. It all depends on the desired behaviour.
As a first approach, I limit the mesh size to a maximum of 2-3x the finite element thickness, or even less, particularly if we have flexural and shear deformations which can be decisive.
For plates that work in their plane (diafragm floors for example) larger mesh sizes can be used.

But there’s nothing like carrying out tests on the deformations to see the effect of the mesh size, and looking for a convergence limit.
2023-05-30-test.gh (60.4 KB)