you need also define the nonlinear material properties for the concrete for CalculiX.
There you have to define a Strain/Young module relationship to cover the nonlinariety in the material section.
Maybe there exists a predefined material.
Afterwards you need to replace the void material with the concrete material properties,
so that its switching between concrete and steel.
Due to the nonlinarity it can happen, that it wont converge.
I hope that it kinda helps you.
jtm2020hyo wrote: ↑Wed Jan 20, 2021 12:15 amsomething like this:
https://wiki.freecadweb.org/Analysis_of ... ith_FEM/en
... here the white lines should be rebars