three-parameter auto-spectral model of wind pressure for wind-induced response analysis on large-span roofs

The unified wind pressure spectra model with certain precision can simplify the wind-induced response analysis and standardize the design process of the wind resistance. An auto-spectral model of wind pressure was proposed with three parameters which denote the descending slope, the dominant frequency and the peak value of the reduced auto-spectral curve respectively. The values of the model parameters were identified and studied statistically based on 4 types of rigid large-span roof models in which 115 typical wind tunnel pressures were measured. The results show that the distribution patterns of the parameters is in accord with the flow characteristics and can be expressed in the form of zone area, which may indicate the physical meaning of the parameters. The zone values of the parameters were summarized statistically, and the wind pressure spectral model was validated by 1) comparing the spectral curves with relevant studies and 2) comparing the wind-induced responses calculated through the proposed model with the wind tunnel data on 642 cases of large-span grid structures. It concludes that the spectral model can be applied in further exploring the wind load characteristics as well as calculating wind-induced responses in engineering practices.