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Question
As per IS 456:2000, the maximum compressive strain at highly compressed fiber in RCC column subjected to bending and axial compression is given by: (Consider no tension in the section).
A.
0.002 + 0.75 × (strain at the least compressed extreme fiber)
B.
0.002 - 0.75 × (strain at the least compressed extreme fiber)
C.
0.0035 + 0.75 × (strain at the least compressed extreme fiber)
D.
0.0035 - 0.75 × (strain at the least compressed extreme fiber)
Answer ( Option D)

0.0035 - 0.75 × (strain at the least compressed extreme fiber)

Solution

Assumptions in design of axially loaded column 
• Max. compressive strain under axial compression = 0.002. 
• Max. compressive strain in case of bending compression = 0.0035. 
• Max. strain at highly compressed extreme fiber in a section subjected to axial compression and bending and when there is no tension in the section = 0.0035 - 0.75 × Strain in least compressed extreme fiber. 
• Strain in tension reinforcement in a section at failure 
should not be less than  
•  In the absence of data, total shrinkage strain = 0.0003.

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