| Ac | The concrete cross-section area |
| Ag | The concrete cross-section area inside the stirrups |
| As | The total longitudinal steel reinforcement cross-section |
| Ast | The steel reinforcement cross-section |
| Asj | The cross-section area of steel reinforcement in RC jacketing |
| fc′ | The concrete compressive strength |
| fy | The longitudinal steel yield strength |
| Pn.max | The design axial load capacity of the RC column |
| Pu.Ex | The experimental ultimate axial load capacity of the RC column |
| Pu.ACI | The ultimate axial load capacity of the RC column from the ACI-318 model |
| ϕ | The capacity safety factor |
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