Karamba shows tension in compression only shells

Hi everybody,

within my thesis I am working with compression only structures and I decided to analyze some of them as shells in Karamba. However, I obtain some negative nxx and nyy, although:

  • the mesh geometry I input for the shell is derived from a compression-only form finding method (so should not lead to tension)
  • I used the new component for defining the concrete properties and I set the tensile strength to be equal to zero
  • I do not have any reinforcement

Still I get some tension forces. Can someone explain me why or how I can fix my model to obtain an only-compression structure? Any help is really appreciated!

Thank you,

Hi, are you able to share your file.