The strain at the level of compression reinforcement is doubly reinforced beam is:

where d' is the effective cover in compression reinforcement and $X_{m}$ is the maximum depth of the neutral axis.

- 1
  
  $0.0035 (1 - \frac{d'}{X_{m}})$
- 2
  
  $0.0035 (1 + \frac{d'}{X_{m}})$
- 3
  
  $0.087 (1 - \frac{d'}{X_{m}})$
- 4
  
  $0.087 (1 + \frac{d'}{X_{m}})$

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