The shape factor is a function of the cross section geometry and is a measure of how efficiently the material is used to resist bending.
k=\frac{M_P}{M_Y}The moment at yield, ๐๐, is given by
M_Y=\frac{P_{Y}L}{4}The plastic moment, ๐๐, is given by
M_P=\frac{P_{P}L}{4}
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