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RE:Shear Flow AISC 13th Ed.

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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