For plate girder, where load bearing stiffeners at supports are the role means of providing restraint against torsion, the moment of inertia of the stiffeners about the centre of web plate I shall not be less than
1
\(\frac{\mathrm{DT}^{3}}{25} \times \mathrm{R} / \mathrm{W}\)
2
\(\frac{\mathrm{D}^{3} \mathrm{R}}{250} \times \mathrm{W} / \mathrm{T}\)
3
\(\frac{\mathrm{WT}^{3}}{250} \times \mathrm{R} / \mathrm{W}\)
4
\(\frac{\mathrm{D}^{3} \mathrm{~T}}{250} \times \mathrm{R} / \mathrm{W}\)