Environmental Engineering Reference
In-Depth Information
Fig. 2.4 Turbulence intensities for various terrain categories
Peak factor (Figure 2.5) according to DIN 1055-4 [12] C.3 (2):
p
2
ln
6
2
ln
0
:
p
g
¼
ð
n
E
t
Þ
þ
ð
n
E
t
Þ
where
t averaging period for reference wind speed v
ref
:t
¼
600 s (
¼
10min)
Expected value for frequency of gust response to DIN 1055-4 [12] C.3 (3):
s
n
E
0
Q
0
þ
n
1
;
x
R
x
Q
0
þ
R
x
;
n
E
¼
where
n
1,x
first natural frequency [Hz] of structure vibration in direction of wind (x
direction)
n
E,0
expected value of frequency [Hz] of gust response of structure assuming a quasi-
static structural behaviour:
Fig. 2.5 Peak factor
