If d is the diameter of a bar, $f_{t}$ is allowable tensile stress and $f_{b}$ is allowable bond stress, the bond length is given by

- 1
  
  $\frac{f_{t} . d}{4 f_{b}}$
- 2
  
  $\frac{π}{4} . \frac{f_{t} . d}{f_{b}}$
- 3
  
  $\frac{π f_{t} . d^{2}}{f_{b}}$
- 4
  
  $\frac{π}{4} . \frac{f_{t} . d^{3}}{f_{b}}$

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