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Steel Structure Design

Q1: When a large value of radius of gyration is not required

A channels are placed back to back

B channel flanges are kept inward

C channel flanges are kept outward

D none of these.

ANS:B - channel flanges are kept inward

The option B is correct;

(1) For outward (back to back) Iyy>Ixx
(2) For inward (face to face) Iyy<Ixx

Ixx is same for both the cases but Iyy from the case-(2) will be least.
So, the minimum moment of inertia will be from the case-(2) and so the minimum radius of gyration.



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