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 s
k,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 : s
k,0 =
1.500 kN/m
2.
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 :
s
k,A =
Sk,200⋅(1+(728as)2) (NTC GAZZETTA UFFICIALE - 3.4.2 (02/2018) - Equation 3.3.8) s
k,578 m =
1.39⋅(1+(728578.0)2) s
k,578 m =
2.266 kN/m
2 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 = ρsn
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 = ρ1.5⋅snmax,sAd
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