Civil Engineering Reference
In-Depth Information
Fig. 6.7
The standard deviation of the dynamic response at
x
=
L
2
versus the mean
r
wind velocity
Single mode three component buffeting response calculations
The solution to this case is given in chapter 4.3, see Eqs. 4.47 and 4.48. What remains
from the development in chapter 4.3 is to expand on the modal load spectrum
S
using
the results from chapter 5.1. As shown above (see Eq. 6.4 and ensuing discussion), the
flow induced buffeting part of the fluctuating load is
Q
i
(
)
qxt
qxt
,
⎡
⎤
y
⎢
⎥
ˆ
(
)
() ( ) (
)
,
x
xt
,
VB
/ 2
=
Bv
⋅
=
ρ
⋅
Bv
(6.32)
⋅
⎢
⎥
z
q
q
⎢
⎥
(
)
qxt
θ
,
⎣
⎦
where
ˆ
B
and
v
are defined in Eqs. 5.9 and 5.12. Thus (see Eq. 4.39)
