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Antennas and open-frame structures - page 21 / 24

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 Drag coefficients for lattice tower  (Lecture 21)

     = solidity of one face = area of members total enclosed area

Australian Standards

0.0             0.2             0.4             0.6              0.8            1.0

Solidity Ratio

4.0

3.5

3.0

2.5

2.0

1.5

 Square cross section with flat-sided members (wind normal to face)

(ASCE-7 : CD = 4.02 – 5.9 +4.0 )

    includes interference and shielding effects between members

Antennas and open-frame structures

CD = 4.2 - 7        (for 0.1< < 0.2)

CD = 3.5 - 3.5     (for 0.2< < 0.5)

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