[TowerTalk] TEMPERATURE COMPENSATED GUY WIRE TENSION FORMULA

[De La Vega, Fernando]

Hi everybody:

I am creating a chart with values for TEMPERATURE COMPENSATED GUY WIRE TENSIONS, I found the following formula:

(0.0065) * ( wire cross sect area ) * ( modulus of elasticity ) * ( temp 1 - 60 deg F) * ( H * H  /  L * L )


Temp 1 = new temperature above or below the 60 deg F

0.0065 = thermal expansion factor of wire

H = horizontal distance between anchor and tower (radius of guy wire)

L = Length of guy = sqrt ( H*H + V*V)

V = vertical distance between anchor and attachment to tower)

However,

( H * H  /  L * L ) = sin2 (angle)

Angle = angle of guy wire and horizontal line

I do not understand why it multiplies by the square sine of the angle !!!

Could please anybody tell why??

Does it have to do something with TIA equations??

Thank you


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Fernando de la Vega, E.I.T.



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