Civil Engineering Reference
In-Depth Information
Table 2-1 Wind Pressure Parameters
Symbol
units
ASCE 7
Equation / Notes
1
Basic wind speed
V
mph
Figure 6-1
2
Occupancy category
I, II, III or IV
Table 1-1
3
Exposure category
B, C or D
6.5.6.3
4
Wind directionality
factor
K
d
Table 6-4
5
Importance factor
I
Table 6-1
Based on Occupancy category from 2
K
zt
= (1+K
1
K
2
K
3
)
2
where K
1
K
2
K
3
are
determined from Figure 6-4
6
Topographic factor
K
zt
6.5.7 &
Figure 6-4
7
Gust effect factor
G
6.5.8
For rigid structures may be assumed =
0.85
8
External pressure
coefficient
Cp
Figure 6-6
For windward to be used with q
z
&
leeward to be used with q
h
depends on
the building ratio L/B
9
Velocity pressure
exposure coefficient
K
z
for
different
heights
& K
h
for
roof
6.5.6.6 &
Table 6-3
Depends on the exposure category
from 3 & the height
q
z
= 0.00256K
z
K
zt
K
d
V
2
I
10 Velocity pressure
q
z
psf
6.5.10 (Eq
6-15)
11 Wind pressure
p
z
psf
6.5.12.2
p
z
= q
z
GC
p
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