SKY PRO 1800 FORCED CIRCULATION MANUAL
C
C
13
3.7 Perform calculation to additional load on buildings
Snow load on roofs per unit area, is estimated by the expression:
s =
μ
i
C
e
C
t
s
k
(1)
where
s
k
characteristic values of ground snow load [kN / m] associated with the standard return period of 50 years,
depending on the site and the altitude
C
e
exposure coefficient
C
t
thermal coefficient
μ
i
shape factor of the roof
according rules Eurocodice1 technical basis of design and actions on structures Part 2-3: Actions on
structures-Snow loads ENV 02.03.1991 with the formula (1).
As for rule C
e
and C
t
take unit value; while for the values of ground pressure is considered as a function of
their dependence from macro zones geographic relevance of each country member of CEN and altitude as
the construction site (keep in mind then the exceptional conditions in which specific sites are not statistically
predictable and probabilistic analytical values). In general, to cover one or more roof pitches, the coefficient
μ
is expressed as a function of
α
subject analysis of the specific case of intended installation.
In addition to the above, for each country member of the CEN are taken into account as required by ENV
3.2.1991 (for example for Ireland to the ground snow load modeling will have a different behavior from Italy,
task, therefore, remains designer predict the actual loading conditions of the site you go on offering a clean
install). The Kloben can still provide adequate technical support to professionals and engineers with focused
analysis.
Picture a – Macro zones according DM 16-01-96 Picture b – Macro zones according NTC 2008
In evaluating the effect of wind on a structure can not be ignored from the place where it stands, its position
relative to the prevailing winds in the area, as well as its ability to form or be through the air. The Italian
regulation conventionally back pressure of the wind, although dynamic in nature, in activities that result in
equivalent static pressure and depressions operating in the direction normal to the surfaces in the building
(for construction of small residential buildings, excluding dynamic effects ).
To define the equivalent static actions on a building, it is necessary, at the beginning, detecting of the
following parameters:
- concerning wind speed [m/s]
- concerning kinetic pressure exerted by the wind [N/mq]
The Italian geographical territory was divided into 9 macro zones, depending on what you get the v
ref
value
(maximum value of the average speed over a time interval of 10 minutes of wind work, measured at 10 m
above ground, on a plot of exposure Category II based on a specific classification):
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