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The design compressive stress in concrete may be taken as:
1. 0.67 fck
2. 0.45 fck
3. 0.87 fck
4. 0.55 fck

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Correct Answer - Option 2 : 0.45 fck

Explanation:

The permissible compressive stress in concrete is taken as 0.67 fck and a partial factor of safety of 1.5 is applied to it. So, final stress comes out to be 0.45 fck.

  • For design purposes, the compressive strength of concrete is assumed to be 0.67 times the characteristic strength of concrete.
  • The partial factor of safety of 1.5 is also to be applied in addition to this.
  • Characteristic Strength of concrete Cube = fck
  • Characteristic strength of concrete in actual structure = 0.67 fck
  • Design strength of concrete in flexural compression = 0.67 fck / partial FOS = 0.67fck / 1.5 = 0.45f­ck

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