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Re: varying shear flow in concrete beam.

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"may be regular if design is for maximum shear location"
 
I agree, but I also am not 100% clear on the issue.  But I think it is like this:
 
The shear that is travelling through the beam, from support to support, will work to separate the beam from the attached piece.  So it is the entire shear that is travelling through the beam, that needs to be worked into the shear flow equation, to keep the two pieces from separating.  So it doesn't matter where you put the shear flow anchors, they just need to make up for that entire shear travelling through the beam, to keep it from separating. 
 
Thinking about it visually, the maximum separation of a beam with an added tab (symmetrically loaded simply supported beam), will usually occur at the ends, and the middle will not see a separation.  The locations of the highest differential movement should see the most anchors, if you include ones in the middle, it is moreso for keeping the tab from shifting laterally, and not for shear flow.  ...
 
I think this is close to an answer, but something is amiss....

--- On Tue, 10/21/08, Paul Guthrie <PGuthrie(--nospam--at)simivalley.org> wrote:
From: Paul Guthrie <PGuthrie(--nospam--at)simivalley.org>
Subject: Re: varying shear flow in concrete beam.
To: seaint(--nospam--at)seaint.org
Date: Tuesday, October 21, 2008, 12:20 PM

Shear flow (& connections) vary although connections may be regular if design is for maximum shear location
 
where q = VQ/I
 
 
Sincerely,
Paul
 
 
Paul Guthrie, PE
Building & Safety
City of Simi Valley
805.583.6885

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