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The effective depth when top flanges are not restrained against rotation and lateral deflection is

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The effective depth when top flanges are not restrained against rotation and lateral deflection is

(a) 2d/3

(b) 2d

(c) d

(d) d/2

I got this question in a national level competition.

The question is from Web Buckling & Crippling in chapter Design of Beams of Design of Steel Structures

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The correct choice is (b) 2d

To explain: The effective depth when top flanges are not restrained against rotation and lateral deflection is 2d, where d is depth of web. Bottom flange is assumed to be restrained against lateral deflection and rotation. for top flanges, the end restraints and effective depth of the web are to be considered.

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