In limit state design, the maximum compressive stress is taken

where $σ_{c k}$ is the characteristic strength of concrete

- 1
  
  $0.336 σ_{c k}$
- 2
  
  $0.446 σ_{c k}$
- 3
  
  $0.556 σ_{c k}$
- 4
  
  none of these

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