Some folks in a structural forum said that shear flow in LRFD is A*Fy because one is dealing with plastic section properties rather than elastic. A*Fy isn't shear flow, it's a shear capacity only. I came up with the following derivation, does it make sense (is it true from a mechanics point of view?):
Shear flow 9th Ed = VQ/I = Vay/I = Va/S
Shear flow LRFD = Va/Z ?
- Jeremy