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# RE: Re: Shear Flow AISC 13th Ed

• To: seaint(--nospam--at)seaint.org
• Subject: RE: Re: Shear Flow AISC 13th Ed
• From: <jwhite(--nospam--at)megr.com>
• Date: Mon, 26 Jan 2009 21:07:31 -0300

```So, S = I/y when y = dist from NA to extreme fiber.

>  -------Original Message-------
>  From: Paul Guthrie <PGuthrie(--nospam--at)simivalley.org>
>  Subject: RE: Re: Shear Flow AISC 13th Ed
>  Sent: Jan 26 '09 20:08
>
>  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)
>  http://www.usc.edu/dept/architecture/mbs/struct/Arch213A/213A-lectures/16-Shear-stress.pdf]
>  http://www.usc.edu/dept/architecture/mbs/struct/Arch213A/213A-lectures/16-Shear-stress.pdf
>
>
>  >>> "Jeremy White" <jwhite(--nospam--at)megr.com> 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 <[LINK: mailto:deviationz(--nospam--at)gmail.com]
>  deviationz(--nospam--at)gmail.com>: 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 <[LINK:
>  mailto:PGuthrie(--nospam--at)simivalley.org] PGuthrie(--nospam--at)simivalley.org> 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
>
>
>  Paul Guthrie, PE
>  Building & Safety
>  City of Simi Valley
>  805.583.6885
>
>  >>> "Jeremy White" <[LINK: mailto:jwhite(--nospam--at)megr.com] jwhite(--nospam--at)megr.com>
>  01/26/2009 10:45 AM >>>
>
>
>  Is shear flow in the 13th edition of the steel manual still VQ/I ?
>
>  - Jeremy

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