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NOT 462-2002-en

THE WIND LOAD AND ITS ASSESSMENT

Description: 

the wind load (q) is the stress that acts against the mast grip point due to the wind pressure on the surface of the antenna.

following the vde 0855 standard in its 1/7.71 section, two cases are taken into account when dealing with the wind pressure p:

  • antenna height less or equal to 20 m:

wind pressure to be considered p=785 n/m2 (80 kg/ m2), corresponding to a wind velocity v = 120 km/h. 2.

  • antenna height higher than 20 m:

wind pressure to be considered p=1080 n/m2 (110 kg/ m2), corresponding to a wind velocity v = 150 km/h. finally,

in order to know the wind load (q) you only have to multiply this p (n/ m2) by the surface of the antenna (m2).

knowing this value you also must consider the mast height, and multiply it by q.

in the next example you can see an application of the above mentioned:

let us figure up that we have a mast 2.5-m height, and we want to install three antennas on it, for example:

  1. fm antenna (located at 2.5m over the grip point),
  2. uhf multichannel antenna of 13 elements (located at 1.5m over the grip point),
  3. vhf (bi) antenna with 4 elements (located at 0.5m over the grip point).

you can know the q of each antenna looking at their technical characteristics (*):

q1 =16n for the fm antenna
q2 =9n for the uhf antenna
q3 =62n for the bi antenna

we calculate the total q adding the contribution of each antenna:

qtotal = (16n x 2.5m) + (9n x 1.5m) + (62n x 0.5m) = 84,5 n.m

Id Anrterior: 
18
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