Civil Engineering - Structural Design Specifications - Discussion


The over all depth of a solid slab is 20 cm and effective depth is 15 cm. The horizontal distance between parallel main reinforcement should not be more than

[A]. 30 cm
[B]. 40 cm
[C]. 45 cm
[D]. 60 cm

Answer: Option C


No answer description available for this question.

Barish Raut said: (Feb 9, 2016)  
The answer is wrong.

As per IS 456-2000 Clause 26.3.3 [b (1)], horizontal distance between parallel main R/f bars must be smaller of the foll:

1. 3 times effective depth i.e. 3 x 15 cm = 45 cm.

2. 30 cm.

So, correct answer is [A] 30 cm.

Chhaya said: (Apr 20, 2017)  
Thanks @Barish Raut.

Ma Sohail said: (Jun 6, 2017)  
Yes, you are correct @Barish Raut.

Priyal P said: (Dec 30, 2017)  
No, 45 is right answer. See question is should NOT BE MORE.

Arun Kumar said: (Apr 6, 2018)  
30 cm is correct because we always take smaller value.

Ankit Raj said: (May 29, 2018)  
45 is correct. I agree with the given answer.

Utsav said: (Jan 4, 2019)  
45 is correct that's why they have mentioned the depth of the slab.

Er Nk said: (Feb 7, 2019)  
Read the question properly.

Not more than.

Prasad Mhatre said: (Mar 12, 2019)  
Correct explanation @Barish.

Option A is the answer because if it is mentioned that it is a secondary r/f then the correct answer is 450 but here it is main r/f.

Chandu said: (Jun 1, 2019)  
I think 3d or 450 whichever small.
As per question, 3d=3*150=450mm.
From above smallest among both is 450mm.

So the answer is 45 cm.

Naga Ase Teh Moi said: (Feb 12, 2020)  
Not more means maximum value so acc. To IS 456:2000 it is 45cm.

Khattak said: (Apr 21, 2020)  
Here the effective depth of slab is mentioned if not then obviously be the smaller one, also they mentioned should not be more than, means 30cm is also possible but the greater here is 45cm, so 45 is the correct answer.

Dipu Halder said: (Jan 5, 2021)  
300 mm is the correct answer.
According to Is 456:2000. Clause 26.3.3.

Mjm Gcek said: (Aug 15, 2021)  
Yes, you are correct. Agreed @Dipu.

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