Formulas: Proportioning Limits for I-Shaped Members

Equation F13-2

Singly symmetric I-shaped members shall satisfy the following limit:

0.1 \leq \frac{I_{y c}}{I_{y}} \leq 0.9

(a) When $\frac{a}{h} \leq 1.5$

\frac{a}{h} \leq 1.5

\left(\frac{h}{t_{w}}\right)_{\max }=12.0 \sqrt{\frac{E}{F_{y}}}

(b) When $\frac{a}{h}>1.5$

\frac{a}{h}>1.5

\left(\frac{h}{t_{w}}\right)_{\max }=\frac{0.40 E}{F_{y}}

where

$a=$ clear distance between transverse stiffeners, in. (mm)