Tall building response (along-wind, across-wind deflection; twist; along-wind, across-wind, and torsional accelerations) to gusty wind is modelled using a computer simulation program. The characterizing feature is the use of wind tunnel force spectra to simulate the across-wind and torsional components of gusty wind. Previous research shows attempts to analytically represent: the along-wind force spectrum; the across-wind force spectrum; the torsional moment spectrum; and the cross-spectrum between across-wind force and torsional moment. For the across-wind force spectrum, three mechanisms must be recognized: the fluctuating lateral turbulence component of wind velocity, motion induced loads, and vortex shedding. Within these, vortex shedding is not completely understood. Thus, an original approach in the formation of the computer simulation program WIND is not the incorporation of another analytical development of the force spectra, but the incorporation of force spectra obtained from wind tunnel studies. Also, this study illustrates in tabular form the gust effect factor methods and the along-wind velocity spectra.

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