Question

The minimum web thickness from serviceability requirement in plate girder, when transverse stiffeners are not provided and web connected to flanges along both longitudinal edges shall satisfy the condition:

• A. \(\dfrac{d}{t_w}\geq 200\varepsilon\)
• B. \(\dfrac{d}{t_w}\leq 200\varepsilon\)
• C. \(\dfrac{d}{t_w}\geq 270\varepsilon\)
• D. \(\dfrac{d}{t_w}\leq 270\varepsilon\)

Hint:

For unstiffened plate girder webs, \[ \boxed{ \frac{d}{t_w}\le200\,\varepsilon } \] is the serviceability requirement as per IS 800:2007.

Answer 1

The Correct Option is B

Step 1: Recall the IS 800:2007 provision. For plate girders without transverse stiffeners and with the web connected to flanges along both longitudinal edges, the web slenderness is limited to prevent excessive web buckling.

Step 2: State the limiting condition. The required condition is \[ \boxed{\frac{d}{t_w}\le 200\,\varepsilon} \] where \[ \varepsilon=\sqrt{\frac{250}{f_y}}. \] Hence, \[ \boxed{(B)} \] is the correct answer.