Hi Dave Diel

Thanks for the reply.I will try to goahead with changing non linear restraints into linear restraints.

I am not able to get your points for the following

In the first paragraph of your reply "

If the node moves: Is the restraint resultant friction force equal to mu*N; Does the friction force vector line up with the displacement vector? If the node does not move, is the restraint resultant friction force less than mu*N.

Can you throw some little bit info about it.I understand that if node move only there is a friction force. if there is no node moves , means that it might be an anchor/semi anchor

and
"Friction is a very "sticky" subject. We include it in CAESAR II to produce conservative results, maybe very conservative results. I, personally, do not expect an accurate prediction of system response. A much more sophisticated analysis algorithm would be required to attempt a better solution"

I understand from your statement that we can choose any friction stiffness from the configure/setup. But choosing the default or greater value would be more conservative !!!

Once again thx for responding immediately.