In a plate girder, if M is maximum bending moment, $σ_{b}$ is allowable bending stress, and t is the thickness of web plate, then the economical depth of plate girder $(d_{e})$ is equal to

- 1
  
  $0.1 \sqrt{\frac{M}{t . σ_{b}}}$
- 2
  
  $1.1 \sqrt{\frac{M}{t . σ_{b}}}$
- 3
  
  $2.1 \sqrt{\frac{M}{t . σ_{b}}}$
- 4
  
  $3.1 \sqrt{\frac{M}{t . σ_{b}}}$

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