User's Manual

Table Of Contents
12 Wind Loading
247
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 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
2
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 Table 40 and Table 41.
Table 40 - La
teral Force – Imperial
Lateral Force (Pound) at wind speed (mph)
Largest Surface
Area (sq ft)
80 100 120 140 150
PTP 600 Series
Bridge - Integrated
1.36
36.6 57.1 82.3 146.2 228.5
PTP 600 Series
Connectorized
1.00
26.9 42 60.5 107.5 168.0
Table 41 - Lateral Force – Metric
Lateral Force (kg) at wind speed (m/s)
Largest Surface
Area (sq m)
30 40 50 60 70
PTP 600 Series
Bridge - Integrated
0.130 12 22 34 49 66
PTP 600 Series-
Connectorized
0.093 9 16 24 35 48