Environmental Engineering Reference
In-Depth Information
- 1-year return wind v
m1
(z)
- 1-year return gust V
e1
(z)
Additional parameters (DIBt guideline [9]):
- Annual average wind speed v
ave
- Average turbulence intensity I
15
- Verification of the wind turbine for compliance with the turbulence intensity of
turbulence category A according to [16].
2.3.1.2 Checking the susceptibility to vibration
According to DIN 1055-4 [12] Section 10, the wind forces acting on structures not
susceptible to vibration are based on the peak dynamic pressure, which is averaged over
a gust duration of 2-4 s (Table 2.2).
According to DIN 1055-4 [12] 6.2 (2), the wind loads for structures acting as
cantilevers may be determined according to the simplified method for structures
not susceptible to vibration (see below) provided the following condition is
satisfied:
x
s
h
d
with
h
ref
¼
25 m
!
2
r
h
ref
h
r
h
h
ref
h
þ
b
b
þ
0
:
125
where
x
s
displacement of top of structure under dead load assumed to act in the direction of
the wind [m]
d
logarithmic damping decrement according to annex F
b width of structure [m]
h height of structure [m].
Table 2.2 Peak dynamic pressure (to DIN 1055-4 [12] Table B.2)
z
j
¼ c
q
ref
d
q
B
z
j
=
10
or
c
min
q
ref
for z
j
<
z
min
Terrain category
I
II
III
IV
c
Factor
2.6
2.1
1.6
1.3
Exponent
d
0.19
0.24
0.31
0.40
z
min
2.00
4.00
8.00
16.00
c
min
1.9
1.7
1.5
1.3
