I have a 3D model and try to split it up into "walls" and "surfaces" with the Building Model and to calculate them separately. However, my structural system becomes unstable then. What can be the reason?
I want to consider the soil-structure interaction using one of the nonlinear soil material models. Why is it not reasonable to calculate the individual load cases with this model?
I received an error message “Surface of incompatible type... (Surface in upper plane of building story must be of ‘Load transfer’ type)” when running the calculation. What is the reason?