| Bar | |||
| db | 0.375 | in | bar diameter. |
| λ | |||
| f'c | psi | Specified 28-day compressive strength of concrete in which the bar is to be developed. | |
| fy | psi | Yield strength of bar to be developed. |
↑ ACI 318-14 Straight Tension Development Length, Ld:
| Ψt | |||
| Ψe | |||
| Ψs | |||
| cc | in | distance from center of bar to nearest concrete surface. | |
| sb | in | center-to-center spacing of bars being developed. | |
| cb | 1.5 | in | |
| Atr | in2 | Total cross-sectional area of all transverse reinforcement within spacing s that crosses the potential plane of splitting through the reinforcement being developed. If unsure of value use 0. | |
| s | in | maximum center-to-center spacing of transverse reinforcement within Ld. | |
| n | number of bars being developed. | ||
| Ktr | 0 |
| \[L_{d} = \text{max } \begin{bmatrix}\text{(a) }\left( \frac{3}{40} \frac{f_{y}}{\lambda\sqrt{f'_{c}}} \frac{\psi_{t}\psi_{e}\psi_{s}}{(\frac{c_{b}+K_{tr}}{d_{b}})} \right) d_{b} \text{ (25.4.2.3a)} \\ \text{(b) }12 \text{ in} \end{bmatrix} \text{[25.4.2.1]}\] | ||
| \[K_{tr} = 0.0 \] | ||
↑ ACI 318-14 Hooked Development Length, Ldh:
| Ψe | |
| Ψc | |
| Ψr |
| \[L_{dh} = \text{max }\begin{bmatrix}\text{(a) } \left(\frac{f_{y}\psi_{e}\psi_{c}\psi_{r}}{50\lambda\sqrt{f'_{c}}} \right)d_{b} \\ \text{(b) }8d_{b} \\ \text{(c) }6 \text{ in} \end{bmatrix} \text{ [25.4.3.1]} \] | ||
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