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Eurocode snow zone per commune in France

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Snow zone and loads map and effect of altitude in France
Eurocodes snow zone per commune, canton and department

Snow zone map in France

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In France, snow regions vary from snow zone A1 (low) for North of France, snow zone A2 for South-West, snow zone B1, snow zone B2, snow zone C1, snow zone C2, snow zone D and snow zone E (highest).

For Saint-Pierre-et-Miquelon there is a snow load available in lisa.blue.

For overseas territories Guadeloupe, Martinique, La Réunion, Guyane, Mayotte, New Caledonia, Wallis and Futuna there is no snow load to consider.

Snow loads values in kN/m², by snow zone according to NF EN 1991-1-3/NA (05 2007)
Snow zones A1 A2 B1 B2 C1 C2 D E
Characteristic value (Sk) of the snow load on the ground to an altitude below 200 m 0,45 0,45 0,55 0,55 0,65 0,65 0,90 1,40
Design value (SAd) of exceptional snow load on the ground - 1,00 1,00 1,35 - 1,35 1,80 -
Characteristic load variation laws for altitudes above 200 m Sk + ΔS1 Sk + ΔS2

Altitude effect
Altitude A ΔS1 ΔS2
from 200 to 500 m
from 500 to 1000 m
from 1000 to 1500 m

Lisa.blue extract for a snow zone A1

Snow

The building is located in snow zone A1 at an altitude of  22 m.
Snow standard
The standard applicable for snow load calculation on this building is EN 1991-1-3 (07/2003) and its national annex FR NA (05/2007).
Characteristic snow load on the ground
The values of surfacic loads ​​of snow on the ground sk,0, corresponding to lower altitudes, are specified by the national annex.
This one provides a country map divided into climatic zones.
For the zone A1, the specified value of the load is : sk,0 = 0.450 kN/m2.
Characteristic snow load on the ground of the site
The load sk,22 m incorporates the influence of altitude here equal to 0.000 kN/m2 :
sk,A = sk,0+0s_{k,0} + 0 (NF EN 1991-1-3 /NA)
sk,22 m = 0.45+00.45 + 0
sk,22 m = 0.450 kN/m2
Normal snow load on the ground of the site
The National Annex does not give the elements for adjusting the snow load on the ground with the return period.
So we will just have: sn = sk,22 m =  0.45 kN/m²
Accidental snow load on the ground of the site
The values of sAd are given by the map attached to this standard. These values are independent of altitude.
sAd =  0 kN/m²(NF EN 1991-1-3 /NA Clause 4.3 )
Equivalent snow depth on the ground of the site
For checkings at serviceability limit states:
  • fresh snow depth = 45 cm,
  • settled snow depth = 22 cm,
  • old snow depth = 12 cm,
  • wet snow depth = 11 cm.
  • with: snow depth = snρ\frac{ \displaystyle s_{n}}{ \displaystyle \rho}
For checkings at ultimate limit states:
  • fresh snow depth = 67 cm,
  • settled snow depth = 33 cm,
  • old snow depth = 19 cm,
  • wet snow depth = 16 cm.
  • with: snow depth = max1.5sn,sAdρ\frac{ \displaystyle \max_{1.5 \cdot s_{n}},s_{Ad}}{ \displaystyle \rho}
with: (Annex E)
  • fresh snow density = 1 kN/m3,
  • settled snow density = 2 kN/m3,
  • old snow density = 3.5 kN/m3,
  • wet snow density = 4 kN/m3
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