Spectral Characteristics of Fluctuating Wind Pressure on a Large-Span Roof

摘要

This paper presents a spectral analysis of fluctuating wind pressure on a large-span roof based on pressure time-series data from a wind tunnel experiment. By considering the influences of the body-induced turbulence on the local wind pressure field, the normalized spectrum and cross-spectrum of wind pressure at several typical locations on the roof were compared with each other. The corresponding spectral characteristics were analyzed. The results show that important effects on the fluctuating wind pressure field are almost constrained to body-generated vortex rather than the approaching flow in a large fraction of the roof. It can be concluded that the current regulation spectra for fluctuating wind pressure do not give a reasonable description for the spectral characteristics in this situation.