Doubler Plate Strength for Pipe to Pipe connections

[civilarchitec]

As with most offshore jackets doubler plates are very common to attach other tubular members ( wall thickness > 1/2 inch) to avoid punching shear. I have seen many engineers rely on Joint Can Re-design to design doubler plate thickness. I would like to know a way to caculate doubler plate dimensions and weld sizes required. I assume there would be a check for Shear, Bending (major & minor), and Tension and the actual loads would be member end forces from the brace member. I assume I would be able to include the wall thickness of the chord member or ignoring would give a very conservative result. Any tips, calcs, or references for pipe to pipe doubler plates definitely helps. thanks.