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Civil Engineering - Structural Design Specifications - Discussion

Discussion Forum : Structural Design Specifications - Section 1 (Q.No. 33)
Structural Design Specifications
33.
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
30 cm
40 cm
45 cm
60 cm
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
14 comments Page 1 of 2.
Barish Raut said:   10 years ago
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:   8 years ago
Thanks @Barish Raut.
Ma sohail said:   8 years ago
Yes, you are correct @Barish Raut.
Priyal p said:   8 years ago
No, 45 is right answer. See question is should NOT BE MORE.
Arun Kumar said:   7 years ago
30 cm is correct because we always take smaller value.
Ankit raj said:   7 years ago
45 is correct. I agree with the given answer.
Utsav said:   7 years ago
45 is correct that's why they have mentioned the depth of the slab.
Er NK said:   7 years ago
Read the question properly.

Not more than.
Prasad Mhatre said:   6 years ago
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.
(1)
Chandu said:   6 years ago
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.
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