According to Vawter and Clark formula, the economical depth of web plate of a plate girder is approximately equal to

[where, M= Maximum bending moment, and $σ_{b}$ = Allowable bending stress]

- 1
  
  ${(M / σ_{b})}^{1 / 3}$
- 2
  
  $2.5 {(M / σ_{b})}^{1 / 3}$
- 3
  
  $3.5 {(M / σ_{b})}^{1 / 3}$
- 4
  
  $4.5 {(M / σ_{b})}^{1 / 3}$

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