Point support moves

mmm, I’m trying some sort of shell analysis and there are some issues…Please help.

  1. it seems like the point supports moved.
    Below image is 10x magnified deformation. (Also the adjacent surfaces do not seem to be aligned correctly.)

  2. The principal stresses do not appear symmetric. Although everything was supposed to be symmetric in the original model.
    Annotation 2020-05-19 152942

Please help :sweat_smile:

Can you post the GH-file?

Here you go. The geometry is internalized. I hope it should be an easy fix…
kiwi3d.gh (228.7 KB)

Thanks in advance!

I had a look at your file: The problem with moving support is easily fixed. We use springs for the supports and you have to apply higher spring stiffness. This can be adapted by right-clicking on the AnalysisModel and setting the penalty factor to a higher value (I added two zeros). This improves the coupling between the patches as well. Then simply update this component by newly connecting a wire upstream.
Regarding the forces, this is also related to the supports. Since you are using point supports, the support is only added to one patch where then high force concentration occurs. Line supports of small lengths are typically better for shell analysis without edge enforcement (as in classical FEM) if the region of the support is important in detail.

Thank you Anna! It is very helpful!