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

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in Design of Steel Structures by (962k points)
The effective depth when top flanges are restrained against lateral deflection but not against rotation is

(a) 2d/3

(b) d

(c) 2d

(d) d/2

The question was asked in an interview for job.

Enquiry is from Web Buckling & Crippling in division Design of Beams of Design of Steel Structures

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Correct option is (a) 2d/3

For explanation I would say: The effective depth when top flanges are restrained against lateral deflection but not against rotation is 2d/3, 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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