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 Drag coefficients for lattice tower

    CD = 3.5 - 4        (for 0.1< < 0.3)

CD = 2.9 – 2       (for 0.3< < 0.5)

 Triangular cross section with flat-sided members

(ASCE-7 : CD = 3.42 – 4.7 +3.4 )

Antennas and open-frame structures

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