From: Scott Maxwell <smaxwell(--nospam--at)engin.umich.edu>
Date: Tue, 6 Feb 2001 20:16:55 -0500 (EST)
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)dot.ca.gov 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?"