In case of a singly under-reinforced beam, the actual neutral Axis lies 

This question was previously asked in
UKPSC JE Civil 8 May 2022 Official Paper-I
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  1. below the critical neutral Axis 
  2. above the critical neutral Axis
  3. at the critical neutral axis
  4. None of the above

Answer (Detailed Solution Below)

Option 2 : above the critical neutral Axis
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Detailed Solution

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Concept:

The different types of sections are as follows:

F3 N.M Madhu 23.03.20 D6

Under reinforced

Balanced section

Over reinforced

Xu < Xu(lim)

Xu = Xu(lim)

Xu > Xu(lim)

Ast < Ast(lim)

Ast = Ast(lim)

Ast > Ast(lim)

MOR < MORlim

MOR = MORlim

MOR > MORlim

Z > Zlim

Z = Zlim

Z < Zlim

xu > xu,critical : Over reinforced section

xu = xu,critical : Balanced section

xu < xu,critical : Under-reinforced section

It can be seen that the actual neutral axis is less than the critical neutral axis for the under-reinforced section and is above the critical neutral axis

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