Ultimate Axial Load Limit (column and wall:ACI 318)
| The strength of a column under truly concentric axial load is | ||
| Pn,o |
|
0.85 * f'c * (Ag - Ast) + fy * Ast |
| For nonprestressed compression members with tie reinforcement, | ||
| φ * Pn,max |
|
0.80 * φ * [0.85 * f’c * (Ag - Ast) + fy * Ast] |