Dear Mr. Baldwin,
we have been working on a project two years ago where the following guidlines for the SIF's of lateral branch connection have been used:
1. In-Plane SIF
For every degree deviating from 90° the SIF(i) had to be increased by 0,5%.
2. Out-Plan SIF
Branch connections d/D <= 0,7 with re-pad had to be treated as unreinforced tees.
For those branch conections without re-pads, with a d/D ratio > 0,7 or operating
at the creep temperatures special analysis or FEA had to be performed.
Hope this helps a bit,
Veit Bockemühl
esn GmbH
Hamburg, Germany
P.S.: Best Wishes for Christmas and the New Year for all readers.
vb@esn-gmbh.com