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Re: Shape Factors and AISC ASD

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The shape factor is the ratio of plastic moment (Mp) to the yield moment
(My).  Thus, since Mp=Z*Fy and My=S*Fy, the shape factor is also the ratio
of plastic modulus (Z) to elastic modulus (S).

Hope that helps,


On Tue, 6 Feb 2001 Stanley_P_Johnson(--nospam--at) wrote:

> For weak axis bending of I-shaped members, the commentary mentions that one
> reason for an allowable stress of 0.75*fy is the favorable shape factor for
> I-shaped members bent about their weak axis.  My question is, "What is a
> shape factor and what influences a shape factor?"