Civil Engineering - Steel Structure Design - Discussion

44. 

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.

Answer: Option B

Explanation:

No answer description available for this question.

Prem Lakwad said: (May 26, 2017)  
Options A is correct because face to face provide large value of radius gyration.

Prem Lakwad said: (May 28, 2017)  
Channel is used as column flange then option B is correct.

Ritu said: (Dec 17, 2017)  
Channel should be placed back to back when less radius of gyration is required.

And should be placed face to face when the large radius of gyration is desirable.

Pellu said: (Jun 1, 2018)  
According to me, Option A is correct.

Ashu said: (Sep 9, 2019)  
Right @Ritu.

Shivakant said: (Oct 1, 2020)  
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.

Ishu said: (Apr 15, 2021)  
option [a] and [c] both are correct

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