Hi everyone,
It will be a very powerful tool if you create a link with Opensees (open source hi level structural analysis software) that allow the user to export the model (geometry, sections, material, loads) to Opensees and, after the nl calculation, import the results from them. The first phase can be done such a special *.str file, and the second it can be done with a special _RT file. Watch on line the power of opensees.
Greetings