Abstract
A full-scale synchronized data acquisition system was set up on the roof of the experimental building at the Texas Tech University Wind Engineering Research Field Laboratory to simultaneously collect approaching wind data, conical vortex images, and roof corner suction pressure data. One-second conditional sampling technique has been applied in the data analysis, which makes it possible to separately evaluate the influencing effects of the horizontal wind angle of attack, <TEX>${\theta}$</TEX>, and the vertical wind angle of attack, <TEX>${\varphi}$</TEX>. Results show a clear cause-and-effect relationship between the incident wind, conical vortices, and the induced roof-corner high-suction pressures. The horizontal wind angle of attack, <TEX>${\theta}$</TEX>, is shown to be the most significant factor in influencing the overall vortex structure and the suction pressures beneath. It is further revealed that the vertical wind angle of attack, <TEX>${\varphi}$</TEX>, plays a critical role in generating the instantaneous peak suction pressures near the roof corner.
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