Environmental Engineering Reference
In-Depth Information
Table 2.5
Integral length L
i
(z) of turbulence (to DIN 1055-4 [12] C.3 (4))
Þ
e
L
i
ðÞ¼
300
ð
z
=
300
ð
L
i
;
zinm
Þ
for z
min
z
300 m
Þ
e
L
i
ðÞ¼
300
ð
z
min
=
300
ð
L
i
;
z
min
in m
Þ
for z
z
min
Terrain category
I
II
III
IV
Exponent
0.13
0.26
0.37
0.46
e
z
min
2.00
4.00
8.00
16.00
v
m
z
ðÞ
L
i
z
ðÞ
1
n
E
;
0
¼
11
S
0
:
615
1
:
where
p
b
h
b
þ
h
L
i
z
ðÞ
þ
10
S
¼
0
:
46
:
58
L
i
z
ðÞ
b, h width, height of structure to DIN 1055-4 [12] Figure C.1
v
m
(z
e
) average wind speed at effective height z
¼
z
e
(see above) to DIN 1055-4 [12]
Table B.2 (see above)
L
i
(z
e
)
integral length of longitudinal component of turbulence in direction of average
wind for z
¼
z
e
(Table 2.5)
Basic gust component Q
0
, squared ([12] C.3 (5))
1
Q
0
¼
0
:
63
b
þ
h
L
i
z
ðÞ
1
þ
0
:
9
Resonance response component R
x
, squared ([12] C.3 (6))
2
2
d
R
x
¼
p
R
N
R
h
R
b
where
d
logarithmic damping decrement for vibrations in wind direction to DIN 1055-4 [12]
annex F
Dimensionless spectral density function R
N
([12] C.3 (7))
8
N
1
;
x
1
þ
10
6
:
R
N
¼
5
=
3
:
2
N
1
;
x
