Civil Engineering - RCC Structures Design - Discussion

Discussion Forum : RCC Structures Design - Section 5 (Q.No. 3)
3.
As the percentage of steel increases
depth of neutral axis decreases
depth of neutral axis increases
lever arm increases
lever arm decreases
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
13 comments Page 1 of 2.

Shreekant said:   2 years ago
I think it's Both options B & D.

Jadeja Divyarajsinh said:   3 years ago
Xu (depth of N.A.) = 0.87fyAst/0.36fckb.
So, Xu proportional to Ast,
Increase with Ast.
(1)

King said:   4 years ago
Only option B is correct because the Neutral axis is compared with the critical Neutral axis to decide to decrease or increase. But the level arm is not compared with any critical level arm. In IS code definition of the critical level arm is not describe anywhere.

So, only option B is correct.

Roy said:   6 years ago
Yes, both B&D are correct @Ashley.

Sopori said:   6 years ago
If steel is increased in the tensile zone, then the neutral axis will move down in the beam, (depth of N-axis will increase).

Suresh chandra said:   6 years ago
Lever arm decrease and Neutral axis increases.
(1)

Vroom said:   6 years ago
%steel propotional to NA.
(1)

DHL said:   6 years ago
Lever arm decreases.

So, Both are true.
(1)

Ashley said:   6 years ago
D can be correct as NA increase LA decreases.
(1)

DVS said:   7 years ago
@Ranjan they didn't ask EFFECTIVE DEPTH of the slab.

But they asked DEPTH OF NEUTRAL AXIS.


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