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

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

(a) 2d/3

(b) 2d

(c) d

(d) d/2

I have been asked this question in examination.

This is a very interesting question from Web Buckling & Crippling topic in chapter Design of Beams of Design of Steel Structures

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The correct choice is (c) d

To explain: 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. The effective depth when top flanges are restrained against rotation but not against lateral deflection is d, where d is depth of web.

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