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Question
Which one of the following statements is NOT correct in reinforced concrete design?
A.
In the cracked section, concrete below the neutral axis is neglected in calculations.
B.
When section is subjected to external loading, resisting moment is developed due to compression in concrete and tension in steel.
C.
In the cracked section, the steel area below the neutral axis is converted into equivalent concrete area.
D.
The neutral axis depth does not depend on the modular ratio.
Answer ( Option D)

The neutral axis depth does not depend on the modular ratio.

Solution

• In cracked section analysis, concrete below the neutral axis is neglected in MOR calculation as the concrete below neutral axis is subjected to tensile stress. So statement 'a' is correct. 
• Moment of resistance is developed by the compressive force in concrete and tensile force in steel. So statement 'b' is correct. 
• In working stress method, steel is converted into equivalent concrete by using modular ratio concept. For both uncracked and cracked section the steel is converted into equivalent concrete area. So statement 'c' is correct. 
• The neutral axis depth is dependent on modular ratio. So statement 'd' is incorrect. 

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