The term 'Bourdon effect' as you rightly note is specifically to do with the behavior of a non-circular, curved section of tube (in a gauge) or for instance pipe (elbow). In addition it is taken out of context and used to describe pressure elongation. I guess that this is the source of your axial forces. Caesar allows you to choose none, axial effects (translation) or translation and rotation. Rotation applies to non-circular bends such as pulled sections. There have been many posts on this issue.