A_{c} |
Area of core of spirally reinforced compression member measured to outside diameter of spiral |

A_{g} |
Gross area of section |

A_{ps} |
Area of prestressed reinforcement |

b |
Width of compression face of member |

f'_{c} |
Specified compressive strength of concrete |

f_{pc} |
Average compressive stress in concrete due to effective prestress force only |

f_{ps} |
Stress in prestressed reinforcement at nominal strength |

f_{pu} |
Specified tensile strength of prestressing tendons |

f_{se} |
Effective stress in prestress reinforcement |

f_{y} |
Specified yield strength of non-prestressed reinforcement |

h |
Overall depth of member |

I |
Moment of inertia of section |

M_{n} |
Nominal moment strength at section |

M_{u} |
Factored moment at section |

N |
Design axial load normal to cross section |

P_{n} |
Nominal axial load strength at given eccentricity |

P_{o} |
Nominal axial load strength at zero eccentricity |

P_{u} |
Factored axial load at given eccentricity |

r |
Radius of gyration of cross section |

Y_{b} |
Distance from bottom fibre to center of gravity of section |

Z |
Section modulus |

Z_{b} |
Section modulus with respect to bottom fiber |

Z_{t} |
Section modulus with respect to top fiber |

δ |
Moment magnification factor |

Φ |
Strength reduction factor |

ρ_{g} |
Ratio of total reinforcement area to cross-sectional area of column |