Civil Engineering - Strength of Materials - Discussion


In a beam, the neutral plane

[A]. may be its centre
[B]. passes through the C.G. of the area of cross-section
[C]. does not change during deformation
[D]. none of these.

Answer: Option C


No answer description available for this question.

Kapil said: (Mar 4, 2016)  
What about "b"?

Deepak said: (Jun 3, 2016)  
Answer B is also correct.

Subhankar said: (Aug 6, 2016)  
Yes B also the answer.

Kanishka Jain said: (Aug 6, 2016)  
At neutral axes, there is no compression &tension. So during deformation, the neutral plane does not change. So option c is correct.

Denzil said: (Dec 2, 2016)  
C is correct because C.G can change especially when we are dealing with cracked section of concrete. The code always assumes the same Neutral Axis or Neutral plane even if it is cracked section.

Mahesh said: (Jul 13, 2017)  
Superb explanation, thanks @Kanishka.

Indu said: (Dec 20, 2017)  
I think Option B is correct.

Pratik said: (Jun 14, 2018)  
The neutral axis passes through the center of forces while the center of gravity is the center of masses. So, B may not be always true. Ex: RCC beam design. But in regular str it coincides.

Bhola Sah said: (Jul 29, 2019)  
Option A is the correct answer.

G Lakshmanna said: (Dec 4, 2019)  
No compression no tension so does not change during deformation. C is correct.

Vivek Kumar Verma said: (Jun 28, 2021)  
Option C is correct because in the case of an RCC prismatic beam neutral plane lies below C.G. (in the case of cantilever RCC beam, above CG).

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