| b | length of the side for square cross-sections and the diameter for circular sections |
| d | depth of the cross-section, = b for square cross-sections |
| e | load eccentricity |
| fco | unconfined concrete strength |
| h | height of the specimens |
| ks | shape factor for the corner radius, = (2r/b)0.72 |
| Nc | axial strength for the concentrically loaded specimens |
| Nc0 | axial strength for the concentrically loaded unconfined concrete specimen. |
| Nc-0 | Nf0 value for 2r/b = 1 (i.e., circular section) |
| Nc-f | Ne value for 2r/b = 1 (i.e., circular section) |
| Ne | axial load capacity (or axial strength) of short columns |
| Nf0 | axial strength for the unconfined concrete specimens |
| r | corner radius |
| Sc0 | structural index of the unconfined circular concrete |
| Scf | structural index of the FRP-confined circular concrete |
| Ss0 | structural index of the unconfined square concrete |
| Ssf | structural index of the FRP-confined square concrete |
| ρ | corner radius ratio, = 2r/b |
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