Mathematical model of acrosswind dynamic loads on rectangular tall buildings

By investigating acrosswind forces on rectangular cylinders with various side ratios at normal attack angle in a boundary layer wind tunnel, this paper presents empirical formula of acrosswind force spectra, RMS lift coefficients and Strouhal numbers of rectangular tall buildings, and coherence functions of acrosswind force are also probed. Thus, a complete analytical model of acrosswind dynamic loads on rectangular tall buildings is established. This model is in good agreement with the experimental results obtained by wind tunnel tests; so it is reliable and applicable. A calculation method based on this model can be developed to evaluate wind-induced acrosswind responses of rectangular tall buildings in frequency domain.