If the breadth of the rib = bw, actual width of flange = b, the distance between points of zeroment in a flanged beam = $l_{o}$ the effective depth of flange = $D_{f}$ , then effective width of flange is

- 1
  
  $\frac{l_{o}}{2} + b w + 6 D_{f}$
- 2
  
  $\frac{l_{o}}{4} + b w + 4 D_{f}$
- 3
  
  $\frac{l_{o}}{6} + b w + 6 D_{f}$
- 4
  
  $\frac{l_{o}}{3} + b w + 3 D_{f}$

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