Analysis of Wind-induced Dynamic Characteristics of a High-rise Building with a Steel Tower

Based on the project of a high-rise building with a steel tower,transient analysis of computational fluid dynamics(CFD)was used to calculate the wind field around the high-rise building and obtain the wind load time history on the structure at first.Then,the wind loads were applied on the finite element model of the structure to compute the dynamic responses.The effects of the factors such as the natural frequency of steel tower and incoming wind direction on the dynamic wind-induced responses and the power spectral density(PSD)of displacement responses of the high-rise structure were analyzed.The results indicate that when the fundamental frequency of the steel tower is close to the structural natural frequency,the spire displacement reaches the maximum value and the whipping effect is more obvious; the spire displacements are highly affected by the incoming wind directions and the most unfavorable wind direction is 135[degrees].Spectral characteristics of spire displacement responses are sensitive to the ch