Development length of bars can be calculated using the following formula:
where Φ = nominal diameter of the bar, σs = stress in the bar at the section considered at design load, τbd = design bond stress.
1
\(\frac{\Phi \sigma_s}{\tau_{bd}}\)
2
\(\frac{\Phi \sigma_s}{4\tau_{bd}}\)
3
\(\frac{\sigma_s}{4\tau_{bd}}\)
4
\(\frac{\Phi \sigma_s}{2\tau_{bd}}\)