Originally Posted by
Nick Ostrowski
Thanks for the info Bruce (very detailed).
It's a curse really. It's the engineer in me. Years ago in my other life as a structural engineer I designed structural steel and connections like this for nuclear and fossil fuel power plants.
That connection is pretty common but if you haven't been around structural steel much it may look odd. In the attached image the beam in Connection D has both flanges coped like the one in your pic.
You learn something everyday. That's what this site is for.