Correct option is A
For a vertical stiffened web of a plate girder, the lesser clear dimension of the panel (either height or width of the web panel between stiffeners) should not exceed 180t, where ttt is the thickness of the web. This limit ensures stability against buckling under shear and compressive forces.
Explanation:
The 180t rule is applied specifically to stiffened webs to prevent local buckling in plate girders subjected to heavy loads. If the dimensions exceed this limit, additional stiffeners or redesign may be required to ensure the structural safety of the plate girder.
