B | = | building width normal to oncoming wind |

C_{D} |
= | drag force coefficient |

C_{M} |
= | non-dimensional moment coefficient |

D | = | building depth |

f | = | frequency |

f_{1} |
= | first mode natural frequency |

g | = | peak factor |

g_{B} |
= | background peak factor |

g_{R} |
= | resonant peak factor |

H | = | building height |

H_{1}(f) |
= | first mode structural transfer function |

I | = | mass moment of inertia |

m | = | mass |

= | expected extreme value of moment or torque response | |

= | mean of moment or torque response | |

= | reference moment or torque | |

= | background base moment or base torque | |

= | resonant base moment or base torque response | |

= | mean wind load | |

= | resonant component of equivalent static wind loading | |

= | resultant wind-induced response | |

= | mean wind-induced response component | |

= | peak background wind-induced response component | |

= | peak resonant wind-induced response component | |

S_{M}(f) |
= | power spectral density of fluctuating base moment or torque response |

S_{M}(f) |
= | power spectral density of aerodynamic base moment or torque |

T | = | observation time |

= | mean wind velocity evaluated at building height | |

= | peak acceleration | |

a | = | exponent of mean wind velocity profile |

g | = | radius of gyration |

j_{1} |
= | fundamental mode shape in direction of motion |

r | = | air density |

s_{M} |
= | root mean square of fluctuating base moment or base torque response |

s_{M} |
= | root mean square of aerodynamic moment |

z_{1} |
= | first mode critical damping ratio |

Subscripts | ||

B | = | background component |

D | = | alongwind direction |

L | = | acrosswind direction |

R | = | resonant component |

T | = | torsional direction |