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The shape factor of an I-section is

1.04 1.14 1.70 2.00

Explanation:

Shape factor

It is defined as the ratio of the plastic moment to yield moment.
It is a function of cross-section or shape and is represented by ' f '.
$f = \frac{M_{P}}{M_{y}} = \frac{f_{y} Z_{P z}}{f_{y} Z_{e z}} = \frac{Z_{P z}}{Z_{e z}}$

Shape factor for different cross-sectional shapes:

Section	Shape factor
Triangular	2.34
Diamond	2
Rectangle / Square	1.5
I - Section	1.12 to 1.14
H - Section	1.5
Circular hollow section	1.27
Solid Circular section	1.67

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