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Antenna towers IBC wind load requirement

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Title: Antenna towers IBC wind load requirement


2000 International Building Code section 3108.4.2 indicates that "Adequate foundations and anchorages shall be provided to resist two times the calculated wind load."  I don't have a structural IBC commentary but heard that there is something written about this.

Is the intent of this section for overturning stability only?  Should footings  be designed for [1.7*[2*wind]+1.4*D]*75 or [1.7*W+1.4*D]*.75?  Should anchor rods be designed for .9*D+1.3*[2*wind] or .9*D+1.3*D?


Scott M. Haan P.E.
Deputy Building Official