Terrain category (TC) Definition
Terrain category I
Open sea; lakes with least open water the wind direction; even, flat land
without obstacles
Terrain category II
Terrain with hedges, individual farmsteads, buildings trees,
e.56
Table 2.g.5 0.5 0.9)
The standards contain statements regarding the
following aspects:
• Framework masts and towers with non-parallel
main legs
• Guyed masts and chimneys
• Cable-stayed and suspension bridges
• Torsional vibrations
Wind zones Germany per DIN 1991-1-4 NA
(country-specific)
Zone
Wind speed
in m/s
Speed pressure
in kN/m²
1 22. (Table 2.9: Basic speeds and speed pressures (state-spe-
cific data)
2nd step: Determining the terrain category (TC)
Terrain-specific loads and dynamic pressures are the
second factor calculating wind loads (Table 2.32
2 25.39
3 27.0 0.10: Terrain categories according DIN 1991-1-4
TBS
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77
Chapter The external lightning protection system
.10). agricultural area
Terrain category III Suburbs, industrial commercial areas; forests
Terrain category IV
Urban areas which least 15% the area built with buildings whose
average height higher than m
Table 2.TBS
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2018
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1st step: determining the wind zone
The second factor that needs known when de-
termining the wind load the wind load zone which
the object located.47
4 30.0 0
