Variables
|
Wind zone |
vb,0 in m/s |
qb,0 in kN/m² |
|
1 |
22,5 |
0,316 |
|
2 |
25,0 |
0,391 |
|
3 |
27,5 |
0,473 |
|
4 |
30,0 |
0,563 |
Fig. NA.A.1 — Map of wind zones for the area of the Federal Republic of Germany
from: DIN EN 1991-1-4/NA:2010-12
Table NA.B.3 — Simplified velocity pressures for buildings up to 25 m in height
|
Wind zone |
Velocity pressure qp in kN/m² at building height h |
|||
|
h £ 10m |
10 m < h £ 18 m |
18 m < h £ 25 m |
||
|
1 |
Midland |
0,50 |
0,65 |
0,75 |
|
2 |
Midland |
0,65 |
0,80 |
0,90 |
|
Coastal areas and Baltic Sea islands |
0,85 |
1,00 |
1,10 |
|
|
3 |
Midland |
0,80 |
0,95 |
1,10 |
|
Coastal areas and Baltic Sea islands |
1,05 |
1,20 |
1,30 |
|
|
4 |
Midland |
0,95 |
1,15 |
1,30 |
|
Coastal areas of North Sea and Baltic Sea and Baltic Sea islands |
1,25 |
1,40 |
1,55 |
|
|
North Sea islands |
1,40 |
— |
— |
|
Table NA.B.1 — Terrain categories
|
Terrain category I Open lakes; Lakes with at least 5 km of open space downwind; smooth, flat land with no obstacles
Length of roughness z0 = 0,01 m Profile exponent α = 0,12 |
|
|
Terrain category II Terrain with hedgerows , singular farms, houses or trees, e.g. agricultural area
Length of roughness z0 = 0,05 m Profile exponent α = 0,16 |
|
|
Terrain category III Suburbs, Industrial zones or business parks; forests
Length of roughness z0 = 0,30 m Profile exponent α = 0,22 |
|
|
Terrain category IV Urban areas in which at least 15% of the area is occupied by buildings whose average height exceeds 15 m
Length of roughness z0 = 1,05 m Profile exponent α = 0,30 |
|
From: DIN EN 1991-1-4/NA:2010-12
Table 7.14 — Increasing factor κ for circular cylinders in a row
|
a/b |
κ |
|
|
2,5 < a/b < 3,5 |
1,15 |
|
|
3,5 < a/b < 30 |
|
|
|
a/b > 30 |
1,00 |
|
|
a Distance b Diameter |
||
|
NOTE For a/b < 2,5 the values for the increasing factor κ may be specified in the National Annex. |
||
