Abstract
Spectral characteristics of wind-induced forces on rectangular column structures are analyzed for the frequency range higher than the spectral peak. The developed model is based on the assumptions that 1) ambient wind turbulence is fully developed and isotropic, and 2)dominant wind forces on the structure are caused by pressure fluctuations associated with the ambient turbulence. Using the Kolmogorov theory and length scales of effective pressure fluctuation, the power spectra of the transverse force on the column are found to be proportional to the frequency to the -10/3 power. The similar analysis leads to the result that the power spectra of the streamwise force are proportional to the frequency to the -4/3 power or -2/3 power, depending on the frequency range.
