When the neutral axis of a T-beam falls outside the flange (below the slab), then

- 1
  
  $b_{F} x d_{F} (n + 0.5 d_{F}) = m A_{s t} (d + n)$
- 2
  
  $b_{F} x d_{F} (n - 0.5 d_{F}) = m A_{s t} (d - n)$
- 3
  
  $b_{F} x d_{F} (n + d_{F}) = m A_{s t} (d + n)$
- 4
  
  $b_{F} x d_{F} (n - d_{F}) = m A_{s t} (d - n)$

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