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Eurocode snow zone in Italy

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

Snow zone map in Italy

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In Italy, snow regions vary between snow zone I-A (Alpine), I-M (Mediterranean ), II and III

Snow loads values in kN/m², by snow zone according to NTC GAZZETTA UFFICIALE (02/2018)
Snow zones I-A I-M II III
Characteristic value (Sk) of the snow load on the ground to an altitude below 200 m 1,50 1,50 1,00 0,60

Altitude effect
Snow zones Sk Altitude > 200m
I-A
I-M
II
III

Lisa.blue extract for a snow zone I-A

Snow

The building is located in snow zone I-A at an altitude of  578 m.
Snow standard
The standard applicable for snow load calculation on this building is EN 1991-1-3 (07/2003) and its national annex NTC GAZZETTA UFFICIALE (02/2018)).
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 I-A, the specified value of the load is : sk,0 = 1.500 kN/m2.
Characteristic snow load on the ground of the site
The load sk,578 m incorporates the influence of altitude here equal to 0.766 kN/m2 :
sk,A = Sk,200(1+(as728)2)S_{k,200} \cdot \left( 1 + \left(\frac{ \displaystyle a_{s}}{ \displaystyle 728} \right)^{2}\right) (NTC GAZZETTA UFFICIALE - 3.4.2 (02/2018) - Equation 3.3.8)
sk,578 m = 1.39(1+(578.0728)2)1.39 \cdot \left( 1 + \left(\frac{ \displaystyle 578.0}{ \displaystyle 728} \right)^{2}\right)
sk,578 m = 2.266 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,578 m =  2.266 kN/m²
Equivalent snow depth on the ground of the site
For checkings at serviceability limit states:
  • fresh snow depth = 226 cm,
  • settled snow depth = 113 cm,
  • old snow depth = 64 cm,
  • wet snow depth = 56 cm.
  • with: snow depth = snρ\frac{ \displaystyle s_{n}}{ \displaystyle \rho}
For checkings at ultimate limit states:
  • fresh snow depth = 339 cm,
  • settled snow depth = 169 cm,
  • old snow depth = 97 cm,
  • wet snow depth = 84 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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