Wind on multi-span gabled roofs with a slope between 10 and 45 degrees for C&C

Figure 4.1.7.6.-F (NBC2020)

v1.0.0

#### Factors

User input values:

q: 1kPa

Importance Factor, ULS: I

C

Roof slope: 26.57 degrees

q: 1kPa

Importance Factor, ULS: I

_{w}= 1.0C

_{e}= (h/10)^{0.2}(but not less than 0.9) = 0.9Roof slope: 26.57 degrees

#### External Wind Pressure

Using figure for multi-span gable roofs with slopes between 10 and 30 degrees.

Zone | C_{p}C_{g} | p_{e} (kPa) |
---|---|---|

c- | -5 | -4.5 |

r- | -3 | -4.5 |

s- | -3.5 | -3.15 |

s'- | -4.2 | -3.78 |

c+ | 1.1 | 0.99 |

r+ | 1.1 | 0.99 |

s+ | 1.1 | 0.99 |

#### Internal Wind Pressure

C

_{gi}= 2C

_{pi}= -0.45 to 0.3C

_{ei}= (h

_{i}/10)

^{0.2}(but not less than 0.9) = 0.9

p_{i} = I_{w}*q*C_{e}*C_{t}*C_{gi}*C_{pi}

p_{i} = -0.81kPa to 0.54kPa

#### Combined Wind Pressure

Zone | C_{pi}=-0.45 p (kPa) | C_{pi}=0.3 p (kPa) |
---|---|---|

c- | -3.69 | -5.04 |

c+ | 0.45 | 1.8 |

r- | -1.89 | -3.24 |

r+ | 0.45 | 1.8 |

s- | -2.34 | -3.69 |

s+ | 0.45 | 1.8 |

s'- | -2.97 | -4.32 |

#### End Zone Width

The end-zone width is the lesser of:• 10% of the least horizontal dimension = 0.1m

• 40% of the height of the building (H) = 0.4m

but not less than:

• 4% of the least horizontal dimension = 0.04m

• 1m

**z = 1m**