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Eurocodes Zoning

Snow, wind and seism zones for a building place

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- What are the French snow zones ?
- How to determine the influence of elevation on the ground snow load in France ?
- How to adjust the ground snow load according to return period in France ?
- Example of results given by the software
- Get the zones for a localisation using Eurocodes Zoning !

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On the map of the national annex, the French territory is divided by canton into five regions of snow identified from A to E. Three of these regions (A to C) are subdivided into two to account for accidental snow precipitation.

Zone | A1 | A2 | B1 | B2 | C1 | C2 | D | E |
---|---|---|---|---|---|---|---|---|

Characteristic value of snow on the ground without elevation s_{k,0} | 0.45kN/m^{2} | 0.45kN/m^{2} | 0.55kN/m^{2} | 0.55kN/m^{2} | 0.65kN/m^{2} | 0.65kN/m^{2} | 0.90kN/m^{2} | 1.40kN/m^{2} |

Design value of exceptional snow load on the ground s_{k,0} | - | 1.00kN/m^{2} | 1.00kN/m^{2} | 1.35kN/m^{2} | - | 1.35kN/m^{2} | 1.80kN/m^{2} | - |

Snow zoning of France (2011-2021)

The French overseas departments, overseas territories and overseas collectivities are not subject to snowfall except Saint Pierre and Miquelon.

Characteristic value of snow on the ground without elevation at Saint Pierre and Miquelon: s_{k,0} = 2.60kN/m^{2}.

Characteristic value of snow on the ground without elevation at Saint Pierre and Miquelon: s

Two distinct variation laws must be applied depending on whether the construction is in snow zone E or not.

Snow loads are calculated as follows:

Snow loads are calculated as follows:

- Up to 200m :
- From 200m to 500m :
- All zones except zone E :
- Zone E only :

- From 500m to 1000m :
- All zones except zone E :
- Zone E only :

- From 1000m to 2000m :
- All zones except zone E :
- Zone E only :

P_{n} is the annual probability of exceedence :

dwl is the design working life, in years. Look at the design working life of buildings in France.

V is the coefficient of variation of annual maximum snow load with V=0.2 for a recurrence interval less than 50 years and V=0.6 for a recurrence interval greater than 50 years.

It should not be applied for annual probabilities of exceedence greater than 0,2 (i.e. return period less than approximately 5 years).

See the features of Eurocodes Zoning for snow analysis in France

Available in English/French, otherwise «Google Translate»! ## B1 - Localization

## B2 - Elevations

## B3 - Building

## B4 - Terrain categories

## C1 - Snow NF EN 1991-1-3/NA (may 2007) + A1 (july 2011)

## C2 - Wind NF EN 1991-1-4/NA (march 2008) + A1 (july 2011) + A2 (september 2012) + A3 (april 2019)

^{*} Here, the orography factor is calculated according to Procedure 1, for an orography consisting of obstacles of various heights and shapes. This type of orography is the most frequently encountered.However, if the building is in a case of orography consisting of well individualized obstacle (isolated hills and ridges or cliffs and escarpments) the orography factor must be calculated according to the procedure 2. According to EN 1991-1-4 §4.3.3(1), the calculated orography factor (1.018) is not taken into account because it does not increase wind velocities by more than 5%. ## C3 - Seism Code of the Environment - Article D563-8-1 (09/01/2015) + JORF n°0248 of 24/10/2010 text N°5

Available in English/French, otherwise «Google Translate»!

3.5332° , 45.7153°

741482m , 6512993m

D 304A, 63120 Sauviat, Auvergne-Rhône-Alpes

741482m , 6512993m

Distances / Direction | At the place of construction | 500m | 1000m |
---|---|---|---|

North | 436 m | 360m | 407m |

Northeast | 405m | 465m | |

East | 456m | 473m | |

Southeast | 419m | 446m | |

South | 449m | 476m | |

Southwest | 432m | 411m | |

West | 360m | 468m | |

Northwest | 403m | 452m |

monumental building

100years

15.0m

80°

Sectors | 1 | 2 | 3 | 4 |
---|---|---|---|---|

Categories | IIIa | IV | IV | IV |

Radius R of the angular sector : 593m

A2 (s_{k,0} = 0.45kN/m^{2})

PUY-DE-DOME (63)

s_{k,436m} = 0.686 kN/m^{2}

s_{100ans} = 0.774 kN/m^{2}

s_{ad} = 1.0kN/m^{2}

2 (v_{b,0} = 24.0m/s)

PUY-DE-DOME (63)

1

Sectors | 1 | 2 | 3 | 4 |
---|---|---|---|---|

Sector definition | from 35° to 125° | from 125° to 215° | from 215° to 305° | from 305° to 35° |

Fundamental value of the basic wind velocity v_{b,0} | 24.0m/s | |||

Shape parameter K | 0.2 | |||

Exponent n | 0.5 | |||

Annual probability of exceedence p | 0.01 | |||

Probability factor c_{prob} | 1.038 | |||

Directional factor c_{dir} | 0.7 | 1.0 | 1.0 | 1.0 |

Basic wind velocity v_{b} | 17.4m/s | 24.9m/s | 24.9m/s | 24.9m/s |

Reference roughness length z_{0,II} | 0.05m | |||

Roughness length z_{0} | 0.2m | 1.0m | 1.0m | 1.0m |

Terrain factor k_{r} | 0.209 | 0.234 | 0.234 | 0.234 |

Height above ground z | 15.0m | |||

Minimum height z_{min} | 5.0m | 15.0m | 15.0m | 15.0m |

Roughness factor c_{r(z)} | 0.904 | 0.635 | 0.635 | 0.635 |

Orography factor^{*} c_{o(z)} | 1.0 | 1.0 | 1.0 | 1.0 |

Mean wind velocity v_{m(z)} | 15.8m/s | 15.8m/s | 15.8m/s | 15.8m/s |

Turbulence factor k_{l} | 0.97 | 0.854 | 0.854 | 0.854 |

Standard deviation of the turbulence σ_{v} | 3.544m/s | 4.989m/s | 4.989m/s | 4.989m/s |

Turbulence intensity I_{v(z)} | 0.225 | 0.315 | 0.315 | 0.315 |

Air density ρ | 1.225kg/m^{3} | |||

Exposure factor c_{e(z)} | 2.102 | 1.292 | 1.292 | 1.292 |

Peak velocity pressure q_{p(z)} | 392.0N/m^{2} | 491.5N/m^{2} | 491.5N/m^{2} | 491.5N/m^{2} |

Peak wind velocity for Serviceability Limit States v_{p(z),SLS} | 91.1km/h | 102.0km/h | 102.0km/h | 102.0km/h |

Peak wind velocity for Ultimate Limit States v_{p(z),ULS} | 111.5km/h | 124.9km/h | 124.9km/h | 124.9km/h |

3 (1.1m/s^{2})

Sauviat, Puy-de-Dome (63)

A seismic analysis is required for this building.