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Re: Shear Modulus

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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 -----
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