So Pradeepd, Chary will need FE (presumably FE-pipe) in any case to get his sifs. Then you propose to return to Carsar and fiddle around with support modelling, where FE-pipe has standard templates, as it does for all the usual fittings and components.

Local shell crushing would be evident in any FE-pipe calc too.

As I pointed out above, in addition to this, local flexibility will tend to govern this kind of analysis assuming it is a thin wall.

I am a strong advocate of Caesar II, but IMHO this particular analysis appears to be much better suited to FE-pipe.