I often use the compression only function of the foundation elastic mat with a specified subgrade modulus. However, I have found over and over again that Staad is automatically unchecking this box and reverting back to allowing uplift reactions if any change is made to the model. For instance, if I run an analysis with compression only then want to modify a load, I go back to model and modify the load and run the analysis however the compression only portion is removed.
Has anyone else had this issue? Is there a solution to this?
Thanks in advance.
Ryan