Wind
Code EN 1993-1-4
Category Wind load
File name files in Load/Wind group

Wind load.clc
Wind - Canopies.clc

Wind - Duopitch roofs.clc

Wind - Flat roofs.clc

Wind - Free-standing walls.clc

Wind - Monopitch roofs.clc

Wind - Multispan roofs.clc

Wind - Signboards.clc
Publisher Nemetschek Scia
Publishing date 31. 3. 2012
Check description Calculation of the wind load on the different roof types and constructions

Coefficients

Coefficient for the wind direction cdir

Coefficients for the wind direction is in the national annex. For Czech Republic - cdir = 1,00.

 

Coefficient of season cseason

Coefficients of seasonis in the national annex. For Czech Republic - cseason = 1,00.

 

Coefficient of orography co

If orography (e.g. hills, cliffs and so) encrease the wind speed more the 5%, the orography coefficients shoul be taken into account. The recommended way for the calculation the coefficient value is in A.3 annex.

In other cases - co = 1,00.

 

Table 4.1 - Category of terain and its parameters

Table - header z0 [m] zmin [m]
0 - Sea or regions at the sea 0,003 1
1 - Lakes or flat areas with minor vegetation and without obstacles 0,01 1
2 - Areas with low vegetation (grass) and isolated obstacles (trees, buildings), their distance is more then 20x obstacle height

0,05

 2
3 - Areas with vegetation or buildings or isolated obstacles, their distance is max 20x obstacle height (vilages, suburb, forest)

0,3

 5
4 - Areas when at least 15% of terain in coverd by buildings, average height is more then 15m 1 10

Wind regions map

 

Dynamic wind pressure

Reference height and wind profile