When torsional restraint at the ends of plate girder is provided only by stiffeners, then moment of inertia of the stiffener about the centre line of the web shall not be less than

[d= Overall depth of the girder, t= Maximum thickness of compression flange, R= Reaction on bearing, and W= Total load on the girder]

- 1
  
  $\frac{d . t}{250} \times \frac{R}{W}$
- 2
  
  $\frac{d^{2} . t}{250} \times \frac{R}{W}$
- 3
  
  $\frac{d^{3} . t}{250} \times \frac{R}{W}$
- 4
  
  $\frac{d^{4} . t}{250} \times \frac{R}{W}$

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