Numerical Simulation Of Wind Load And Wind Vibration Response Of Super High-rise Buildings

Wind load is one of the key problems to be considered in the structural design of super high-rise buildings,and there are many engineering accidents in which the structures of super high-rise buildings are damaged to different degrees due to insufficient wind-resistant design.Therefore,it is necessary to study the wind-induced response of super high-rise buildings.At present,there are two kinds of wind vibration response analysis methods for wind-sensitive complex super-tall buildings: frequency domain method and time domain method.In addition,during the service of super highrise buildings,the wind field they are in is often affected by the changes in the surrounding environment,which is quite different from the wind field considered in the design of high-rise buildings.The time and economic cost to rerun the wind tunnel test is high.Therefore,it is a reasonable choice to obtain wind load through wind field simulation combined with wind pressure coefficient of high-rise buildings,and then analyze the wind-induced response by time-domain analysis.At present,the accuracy and applicability of this method need to be further verified.To this end,the following main studies are carried out in this paper:(1)in this paper,an ultra-high building structure is taken as an engineering research background,and the time history of the pulsation wind speed at each node in the vertical direction of the structure is simulated by using the AR model of the linear filter method,and the simulated pulsation wind speed power spectrum is compared with the target power spectrum(Davenport spectrum and Harris spectrum).(2)based on the above simulated wind field,the wind-induced response of a super high-rise building was analyzed.After the time-history results of base shear,displacement and acceleration of downwind and transverse wind directions of the structure were passed through the Fourier transform,the base shear self-power spectrum,displacement self-power spectrum and acceleration self-power spectrum were respectively obtained.The time-history results of base shear,top acceleration and top displacement responses to downwind and crosswind wind directions corresponding to Davenport's wind speed spectrum and Harris' s wind speed spectrum were statistically analyzed,compared with load code method and wind tunnel test results,and the effectiveness of wind vibration analysis of super-tall buildings with simulated wind field was evaluated.(3)finally,the influence of different parameters on the time history results of downwind wind vibration response of super high-rise buildings is studied,mainly including the changes of wind load time history sample size,damping ratio and ground roughness.It provides reference for the wind resistance design of engineering structure.