I know there is a way to get the results for frame members from post-processing for each load cases which also includes D and L. Similarly is there a way to get the results for the gravity steel members?
Not thru the data extractor. We provide design results there, but not forces. Use the various reports like "Reactions" in Ram Steel Beam or "Loads" in Ram Steel column to get what you are after.
Thank you Seth! Is it possible using RAM Data Access?
Yes, you can get reactions or critical forces thru DA.
Seth: Thank you! When you say "critical forces" does that mean factored load combinations? Or will it give forces for each load case separately?
Check the RAM DataAccess Developers Guide.pdf, I believe you can get unfactored and uncombined forces if that's what you want.