Shear Flow AISC 13th Ed

[Jeremy White]

Is shear flow in the 13th edition of the steel manual still VQ/I ?

 

- Jeremy 

 

[David Topete]

why would shear flow change from one edition to the next?

On Mon, Jan 26, 2009 at 10:45 AM, Jeremy White <jwh...@megr.com> wrote:

Is shear flow in the 13th edition of the steel manual still VQ/I ?

 

- Jeremy 

 

--
David Topete, SE

[Paul Guthrie]

• 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" <jwh...@megr.com> 01/26/2009 10:45 AM >>>

[Scott, William N]

The fundamentals do not change with the design code revisions.

 

Bill

---

From: Jeremy White [mailto:jwh...@megr.com]
Sent: Monday, January 26, 2009 9:45 AM
To: sea...@seaint.org
Subject: Shear Flow AISC 13th Ed

[Anantha Narayan]

Look in Page 1-7 of AISC 13th Edition. It talks about the VQ/I shear equation albeit for W shape with cap channels

--
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[Jeremy White]

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

[Mark Johnson]

not true that I/y = S the way you have defined y. MJ --- On Mon, 1/26/09, Jeremy White <jwh...@megr.com> wrote:

[Paul Guthrie]

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

>>> "Jeremy White" <jwh...@megr.com> 01/26/2009 2:08 PM >>>

[jwh...@megr.com]

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

> -------Original Message-------
> From: Paul Guthrie <PGut...@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)

> [LINK:
> 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" <jwh...@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:devia...@gmail.com]

> devia...@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:PGut...@simivalley.org] PGut...@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:jwh...@megr.com] jwh...@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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