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RE: Shear Modulus

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Jason,

If it helps, section R13.6.4.2 of ACI 318R-02 (commentary) does give a
shear modulus that is used for determining beta in the torsion provisions
(I believe).  The value that they use is apparently 0.5*E.

Regards,

Scott
Adrian, MI


On Wed, 31 Aug 2005, Jason Christensen wrote:

> Thanks guys, I was just looking for values for Poisson's ratio.  Your values
> are close to what I came up with.
>
>
>
> Jason
>
> -----Original Message-----
> From: Daryl Richardson [mailto:h.d.richardson(--nospam--at)shaw.ca]
> Sent: Wednesday, August 31, 2005 3:06 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Shear Modulus
>
>
>
> Jason,
>
>
>
>         There is always the old stand by equation
>
>
>
>         E = 2G(1+u)
>
> where
>
>         E = Young's Modulus.
>
>         G = shear modulus, and
>
>         u = Poisson's ratio.
>
>
>
>         Really good quality (high strength,low w/c ratio) concrete may have
> u = 0.2, otherwise values of 0.25 or 0.3 may apply.
>
>
>
>         I understand the above equation to be correct but the values I have
> suggested may be suspect.  I expect that Gail Kelly may be a good source of
> this data.
>
>
>
>         Hope this isn't too misleading for your purposes.
>
>
>
> Regards,
>
>
>
> H. Daryl Richardson
>
> ----- Original Message -----
>
> From: Jason <mailto:jason.christensen(--nospam--at)es2eng.com>  Christensen
>
> To: seaint(--nospam--at)seaint.org
>
> Sent: Wednesday, August 31, 2005 2:08 PM
>
> Subject: Shear Modulus
>
>
>
> Does anyone know where I can find an equation for the Shear Modulus, G, of
> concrete.  I have looked in ACI 318 and some text book but could not locate
> an answer.  I know masonry estimates this value to be about 0.4*E, could
> this value be used for concrete also?
>
>
>
> Jason
>
>

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