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What is the strain value for failure in direct compression?

What is the strain value for failure in direct compression? Correct Answer 0.002

Explanation:

Maximum Compressive Stress of Concrete in Design Practice

  • The compressive strength of concrete in an actual concrete structure cannot be expected to be exactly the same as that obtained from a standard uniaxial compression test for the same quality of concrete.
  • There are many factors responsible for this difference in strength, mainly, the effects of duration of loading, size of the member (size effect), the strain gradient, and the multi-axial state of stress.
  • The value of the maximum compressive stress (strength) of concrete is generally taken as 0.85 times the ‘specified cylinder strength’ (f'c), for the design of reinforced concrete structural members (compression members as well as flexural members).
  • This works out approximately to 0.67 times the ‘characteristic cube strength’ (fck) - as adopted by the Code.
  • The Code also limits the failure strain of concrete to 0.002 under direct compression and 0.0035 under flexure.

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