IS code considering concrete has reached its limit state of collapse when the strain is
- A0.0015
- B0.0020
- C0.0030
- D0.0035Correct
Solution
Concept
Limiting strain in concrete
Formula
εcu = 0.0035
Step-by-step solution
1. IS 456: maximum strain in concrete in flexure at the extreme fibre is 0.0035.
Explanation
Crushing of concrete in bending is taken to occur at a strain of 0.0035.
Why the other options are wrong
0.002 is the strain at the end of the parabolic part.
Shortcut
Flexure 0.0035; compression 0.002.
Common mistake
Choosing 0.002.
Correct answer: D) 0.0035