Identify the INCORRECT statement with respect to concrete Stress block in compression of a singly reinforced cement concrete section.

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SSC JE Civil 05 Jun 2024 Shift 1 Official Paper - 1
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  1. The depth of centre of compressive force from the extreme top fibre in compression is 0.42xu.
  2. The bending stress at the neutral axis of the section is zero.
  3. The area of stress block is equal to 0.36 fckxu.
  4. The bending stress at extreme fibre is 0.67 fck.

Answer (Detailed Solution Below)

Option 4 : The bending stress at extreme fibre is 0.67 fck.
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Detailed Solution

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Concept:

Stress and Strain Diagram of a Singly Reinforced Beam in Limit State Method:

F1 Abhayaraj 25.2.21 Pallavi D1

Where Xu = Actual depth of neutral axis

fck = Characteristic compressive strength of concrete

fy = Yield stress of steel

The depth of centre of compressive force from the extreme top fibre in compression is 0.42xu.

The bending stress at the neutral axis of the section is zero.

The area of stress block is equal to 0.36 fckxu.

The compressive strength of concrete for design porpouse is 0.67 fck.

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