I'm thinking I am missing something easy here, please help me out..
With non-linear can I force a deflection in a certain direction using a fixture , then remove the fixture completely to see where it remains at rest? I tried using the time curve but if I put it to 0 on the last step it forces final deflection to be 0. I want it to be free. How can this be achieved?
No. However, you can run the fixed displacement case and get the force needed to get where you want to go and then you can relax the force. I can imagine problems where you need to get a bit more creative and the full load trajectory maybe required to get the location to the right spot the right way before you relax it. Good luck.
I do know other codes that will allow a restraint BC to be tunred off.