Wind Loading; Calculation Of Lateral Force - Motorola PTP 600 System User Manual

12

Wind Loading

12.1 General
Antennas and electronic equipment mounted on towers or pole mounted on buildings will
subject the mounting structure to 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 600 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 . v
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 600 Series bridge (integrated or connectorized model)
at different wind speeds is shown in
PTP 600
Bridge - Integrated
PTP 600
Bridge
Connectorized
T able 22 and
1 1 8 7 H
Largest Surface
Area (sq ft)
Series 1.36
Series 1.00
-
Table 22 - Lateral Force – Imperial
2
T able 23.
1 1 8 8 H
Lateral Force (Pound) at wind speed (mph)
80 100
37 57
27 42
184
120 140 150
82 112 129
60 82 95