Non-deformable zones

Users can define non-deformable zones in shells. When a non-deformable zone is introduced on a shell, there is the hypothesis that that part of the shell is infinitely rigid. Non-deformable zones can be used to simulate the size of nodes. When a local analytical model is generated from StruBIM Design, a non-deformable zone is placed at the support of each column, with the same size as the column.