Interesting write-up on converting between BIM modeling and structural analysis apps.
Amazing to hear that section properties from Revit transfer better compared to Aecosim; rotated beams can't be modeled in Aecosim (p120); loads, load cases and load combinations could only transfer for concrete beams? (p121)
The overall impression is that Revit<>RSA will provide a much better interop experience. This is a bit of a shame given Bentley's large family of apps, which is being sold as providing a 'Common Modeling Environment'.
Aecosim <> STAAD should be silky smooth.