The ensure that under the applied moment the concrete and steel in singly reinforced beam reach their stresses, the minimum area of steel

where bd is the effective compression area and $σ_{ψ}$ is the characteristic

- 1
  
  $0.42 \frac{b d}{σ_{y}}$
- 2
  
  $0.36 \frac{b d}{σ_{y}}$
- 3
  
  $0.85 \frac{b d}{σ_{y}}$
- 4
  
  $0.87 \frac{b d}{σ_{y}}$

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