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SWH Solar Racking Installation Guide | Version 12.10.v2
[1.2.] Procedure to Calculate Total Design Wind Load per ASCE 7-10
Source: ASCE-7-10 Chapter 26, page 253
Figure 26.8-1
(cont’d)
WIND LOADS: GENERAL REQUIREMENTS
Topographic Factor, K
zt
Equations:
2
3
2
1
zt
)
K
K
K
(1
K
+
=
below
table
from
determined
K
1
)
L
x
-
(1
K
h
2
μ
=
h
z/L
-
3
e
K
γ
=
Parameters for Speed-Up Over Hills and Escarpments
K
1
/(H/L
h
)
m
Hill Shape
Exposure
g
Upwind
Downwind
B
C
D
of Crest
of Crest
2-dimensional ridges
(or valleys with negative
H in K
1
/(H/L
h
)
1.30
1.45
1.55 3
1.5
1.5
2-dimensional escarpments
0.75
0.85
0.95 2.5
1.5
4
3-dimensional axisym. hill
0.95
1.05
1.15 4
1.5
1.5
14