Mike - That's not entirely true. You merely have to demonstrate the seismic forces are less than 50% of the wind forces. And, that's usually the case.

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Even in high seismic zones. It just usually takes some extra effort to demonstrate that. I built an example (back when TnxTower was still RISATower) of an SST in the highest seismic zone in the US (Sds - 1.69 and Sd1 = 1. Free Scan To Pdf Software Download. 17) located in a reasonable wind zone (80mph) and I found the following: Method 1 (equivalent static) force = 85% of wind shear Method 2 (equivalent modal) force = 65% of wind shear Method 3 (modal response spectra analysis) = 43% of wind shear This was put together originally as TnxTower / RISATower training materials. All told, it took me 14 pages of increasing complexity to eventually demonstrate that none of my work was really required.