Long and short spans of a two way slab are $l_{y}$ and $l_{x}$ and load on the slab acting on strips parallel to $l_{x}$ and $l_{y}$ be $w_{x}$ and $w_{y}$ respectively. According to Rankine Grasshoff theory

- 1
  
  $\frac{W_{x}}{W_{y}} = \frac{l_{y}}{l_{x}}$
- 2
  
  $\frac{w_{x}}{w_{y}} = {(\frac{l_{y}}{l_{x}})}^{3}$
- 3
  
  $\frac{W_{x}}{W_{y}} = {(\frac{l_{y}}{l_{x}})}^{3}$
- 4
  
  $\frac{W_{x}}{W_{y}} = {(\frac{l_{y}}{l_{x}})}^{4}$

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