-In case of D/t > 100, you may calculate SIF thru' FE and enter that values in CAESAR II, at both header and branch.

-Model rigid elements in CAESAR II, at support location, to take into account radial growth.

-In case of sadddle support, gravity type, you may model two +Y restraints, on the either side of the shell, instead of just defining one in the centre.

-Moreover, due to thin shell (if D/t >100), local crushing strength should be done at support location.