I'm designing foundations for a series of flag pole-style wind turbines poles with vertical vanes. In using ASCE7-05 method II wind design I'm interpreting the Cf of "other structures" as coming from Fig 6-22 "Open signs and Lattice Framework". However I could make the argument that I could use Fig 6-21 chimneys and other structures Cf which would significantly lower my wind load. The structure is a pole with 3 vertical vanes or airfoils that spin around horizontally. Any suggestions? TIA
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