I think I can confirm Alcor thesys: CaesarII is not in compliance with EN13480: CaesarII use Fc (or Fh, is the same in the game of minimum values) instead of Ff for allowable stress in the sustained load cases (out of creep zone Ff = F).

I think that CaesarII can not handle two different sets of "basic" stress required by EN13480: one based on Rm/2.4 for the evaluation of F, the other based on Rm/3 for the evaluation of Fc/Fh. When Rm/3 "dominates" the calculation, Fc is lower than F therefore Fh is lower than F.

In these cases, EN13480 requires F but CaesarII uses Fh (I can say ... conservatively but not correctly).

Not simple to solve for Intergraph...