Column Splices & Bond

Analyze compression development lengths ($\ell_{dc}$) and lap splice requirements for column longitudinal bars and footing dowels based on ACI 318M-11.

1. Compression Development Length ($\ell_{dc}$)

ℓdc
$$ \ell_{dc} = \max \left( \frac{0.02 f_y d_b}{\lambda \sqrt{f'_c}}, 0.0003 f_y d_b, 200 \text{ mm} \right) $$

2. Compression Lap Splice

Lap

3. Tension Hook Development ($\ell_{dh}$)

ℓdh
$$ \ell_{dh} = \max \left( \frac{0.24 \psi_e f_y d_b}{\lambda \sqrt{f'_c}}, 8d_b, 150 \text{ mm} \right) $$