Civil Engineering - GATE Exam Questions - Discussion

33. 

The permissible bending tensile stress in concrete for the vertical wall of an R.C. water tank made of M 25 concrete is :

[A]. 8.5 N/mm2
[B]. 6.0 N/mm3
[C]. 2.5 N/mm2
[D]. 1.8 N/mm2

Answer: Option D

Explanation:

No answer description available for this question.

Kavitha said: (Nov 14, 2014)  
= 0.36 root factor.
= 0.36*root 25.
= 1.8.

Sl Meghwar said: (Jan 7, 2015)  
fr = 7.58sqrt(compressive strength in psi) according to ACI-Code.

Freddy said: (Sep 8, 2015)  
= 0.36 root factor.
= 0.36*root 25.
= 0.36*5.
= 1.8.

Kirubakara Raj said: (Aug 16, 2016)  
Thank you very much for the explanation.

Leena said: (Jan 23, 2017)  
Thank you all for the solution.

Hariram said: (May 30, 2017)  
How come 0.36?

Please explain in detail.

Sheela said: (Dec 18, 2017)  
@Hariram.

As per IS Code: Permissible bending stress= 0.36*√ fck= 0.36*√ 25= 0.36*5 = 1.8.

Anoms said: (Apr 5, 2018)  
Thanks @Sheela.

Monika said: (Nov 18, 2018)  
According to me, it is 1.7 √fck.

Shantanu said: (Aug 26, 2019)  
The formula is 0.25 √of grade of concrete.

Kali said: (Jan 28, 2020)  
Isn't it 0.7√fck?

Jeetu said: (Oct 14, 2020)  
You are right, thanks @Sheela.

Adi said: (Aug 21, 2021)  
I working stress Method Permissible bending Tensile stress = fck/factor of safety = 25/14.

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