Environmental Engineering Reference
In-Depth Information
Fig. 2.6 Basic force coef
cients for cylinders, see DIN 1055-4 [12] Figure 19
Table 2.7 Equivalent roughnesses (to DIN 1055-4 [12] Table 11)
Masonry
Smooth
concrete
Rough
concrete
Timber
Steel
Steel including
bolt-heads etc.
k [mm]
4
2
10
2
0.5
1
q peak dynamic pressure to 1055-4 [12] Table B.2, that is without taking into account
the dynamic effect of the wind:
q
¼
q
B
z
j
¼ c
q
ref
d
z
j
=
10
or
c
min
q
ref
for z
j
<
z
min
r¼
1.25 kg/m
3
b diameter of cylinder [m]
n
r
density of air:
n¼
15
10
6
m
2
/s
kinematic viscosity:
Fig. 2.7 Slenderness reduction factor
c
l
to DIN 1055-4 [12] Figure 26, for a solidity ratio
w¼1.00
