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RE: Re: Shear Flow AISC 13th Ed

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Appears completely correct to me.  My experience with shear flow is in retrofits to wood beam members - which typically end up not feasible.  An important thing to remember with shear flow is the results are in force/in not force per foot.  This may be less of a problem in steel.
This is a link for good diagrams and examples (ASD)

>>> "Jeremy White" <jwhite(--nospam--at)> 01/26/2009 2:08 PM >>>
Hmm.  Right there in the front, huh.
My derivation is based on the fact that Q = ay 
a = the area of the member above/below the point of interest
y = the distance to the CG of the area considered from the NA of the section
Replacing Q in the equation with "ay" you get Vay/I.  I/y = S therefore Va/S, right?  So with LRFD/ASD 13th you are to use Z in place of S.  So you get Va/Z.  Is this completely wrong or a loop hole?
- Jeremy
Quoting Anantha Narayan <deviationz(--nospam--at)>:
Look in Page 1-7 of AISC 13th Edition. It talks about the VQ/I shear equation albeit for W shape with cap channels

On Mon, Jan 26, 2009 at 2:16 PM, Paul Guthrie <PGuthrie(--nospam--at)> wrote:
  • Not sure, not in the index, could not locate shear flow anywhere, is there a specific section you know of?
  • Seems more of a textbook mechanics type deal
Paul Guthrie, PE
Building & Safety
City of Simi Valley

>>> "Jeremy White" <jwhite(--nospam--at)> 01/26/2009 10:45 AM >>>
Is shear flow in the 13th edition of the steel manual still VQ/I ?
- Jeremy