In a doubly-reinforced beam if c and t are stresses in concrete and tension reinforcement, d is the effective depth and n is depth of critical neutral axis n, the following relationship holds good

- 1
  
  $\frac{m c}{t} = \frac{n}{d - n}$
- 2
  
  $\frac{m + c}{t} = \frac{n}{d + n}$
- 3
  
  $\frac{t + c}{m} = \frac{d + n}{n}$
- 4
  
  $\frac{m c}{t} = \frac{d - n}{t}$

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