I have question regarding the B31J SIFs and how that could impact the 3-point method for modeling branch connections with a rigid element going from the centerline of the header to the OD of the header. Originally, using the appendix D SIF method in ASME 2018 code, we would place the calculated SIFs at the end of the rigid portion on the branch line to calculate code stresses at the actual branch to header connection. Now using the calculated B31J SIFs and flexibility factors for the header and the branch, how do we input that information using the 3-point method? Do we place the branch SIFs at the OD of the header now? Can you provide details of how to implement the 3-point method using B31J SIFs?
Thanks.
A correction to my question above... I meant 2-point method. I was wondering if the rigid option is still necessary and if a node at the OD of the header should be the branch SIF or the header SIF. Sorry for the confusion. I need guidance on how branch connections should be modeled now with B31J inputs.