If the effective depth of a doubly reinforced concrete beam is d, and maximum stress in steel and concrete is $σ_{s t}$ and $σ_{c b}$ respectively, then the neutral axis depth factor (k) is given by

- 1
  
  $k = \frac{m σ_{c b} + σ_{s t}}{m σ_{c b}}$
- 2
  
  $k = \frac{m σ_{c b}}{m σ_{c b} + σ_{s t}}$
- 3
  
  $k = \frac{m σ_{c b} - σ_{s t}}{m σ_{c b}}$
- 4
  
  $k = \frac{m σ_{c b}}{m σ_{c b} - σ_{s t}}$

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