The slenderness ratio for the portion of web acting as a column, when the two flanges are restrained against lateral displacement and rotation, is equal to
[h= Clear depth of web between root fillets, and $t_{w}$ = Thickness of web]

- 1
  
  $\frac{h}{t_{w}}$
- 2
  
  $\frac{\sqrt{3} h}{t_{w}}$
- 3
  
  $\frac{\sqrt{5} h}{t_{w}}$
- 4
  
  $\frac{\sqrt{6} h}{t_{w}}$

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