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12 Wind Loading
12.1 General
Antennas and electronic equipment mounted on towers or pole mounted on buildings will subject
the mounting structure to significant lateral forces when there is appreciable wind. Antennas are
normally specified by the amount of force (in pounds) for specific wind strengths.
The magnitude of the force depends on both the wind strength and size of the antenna.
12.2 Calculation of Lateral Force
The 500 Series bridge with or without the integral antenna is essentially a flat structure and so
the magnitude of the lateral force can be estimated from:
Force (in pounds) = 0.0042 . A . v2
Where A is the surface area in square feet and v is the wind speed in miles per hour.
The lateral force produced by a single 500 Series bridge (integrated or connectorized model) at
different wind speeds is shown in
PTP 500 Series Bridge -
Integrated
PTP 500 Series Bridge -
Connectorized
PTP 500 Series Bridge - Integrated
PTP 500 Series Bridge -
Connectorized
Wind Loading
Table 18
and
Table
Largest Surface Area (sq
ft)
1.36
1.00
Table 18 Lateral Force – Imperial
Largest Surface Area (sq m) Lateral Force (Kg)
0.130
0.093
Table 19 Lateral Force – Metric
143
19.
Lateral Force (Pound)
at wind speed (mph)
80 100 120 160 200
27
41
27
42
at wind speed
(m/s)
30 40 50 60 70
12
9
57
101
164
60
98
N/A
22
34
49
66
16
24
35
48
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