Bolted joints (or "screws") can be modeled with Abaqus connector elements (basically springs that connect the things being fastened together) with stiffnesses equivalent to the actual joint. There is a lot of literature out there on how to calculate these stiffnesses. After you run your...
Can Abaqus calculate the Laminate Equivalent Properties of a shell composite layup? It's really easy to do this in FEMAP, but I haven't figured out how to do this in Abaqus yet.
Thanks,
Victor