Time-history Analysis Of Across-wind Vibration Of High-rise Buildings Based On The Turbulent Fluctuating Pressure

With the increasing height of the building, the wind-induced response is more significant. When the aspect ratio of the building is greater than four, the across-wind response is often greater than the along-wind to become a key factor. Compared to the along-wind, the across-wind vibration is more complicated, a variety of factors usually to be considered, such as the aspect ratio, height and the natural frequency of structure. And when the wind affected by the building, the turbulence pressure on the lateral wall of the building may produce significant effect to the structure. This dissertation has studied the horizontal turbulence spectrum models of the seven typical rectangular high-rise buildings. Furthermore, the time-history analysis of across-wind vibration based on the horizontal turbulence spectrum has been carried out. And the effects on the spectrum model and the wind vibration response of different sections and different heights have been studied.This dissertation has studied correlation parameters of the across-wind load based on China, Japan and Australia load code, including the basic wind speed, the average wind speed profile, the wind pressure coefficient variation of height, the peaking factors and the across-wind load spectrum. And by citing a number of high-rise buildings, the effects on the three national across-wind load codes have been studied with the change of the aspect ratio, period, damping ratio, height and the basic wind pressure. Finally, the comparative analysis based on the calculation results of the three national across-wind load codes has been carried out.This dissertation also has done the comparative analysis of the horizontal turbulence spectrum model. The wind field around the buildings was simulated by the computational fluid dynamics(CFD) and the corresponding wind data was extracted. The horizontal turbulence spectrum models of the seven typical rectangular high-rise buildings were solved by using the matlab programming. And the dissertation has studied the effects on the horizontal turbulence spectrum model of different sections, different heights and other related parameters. Furthermore, the horizontal turbulence spectrum, the spectrum of the Japanese load code and the vortex shedding spectrum based on the wind tunnel tests have been compared and analyzed. Finally, this dissertation has done the comparison with the measured spectral curves from the prototype observation. The results show that different sections and different heights have effect on the spectrum model. The turbulent spectrum show a relatively wide band distribution and the results are in good agreement with the measured spectral curves of the prototype in the frequency range of concern.Based on the horizontal turbulence spectrum models of the seven typical rectangular high-rise buildings, considering the vertical coherence of the wind, the corresponding wind pressure in time-history of the across-wind has been simulted by the harmonic superposition method. And using the corresponding wind pressure as the input load, the time-history analysis of across-wind vibration of the seven typical rectangular high-rise buildings have been done by using the Newmark-β method. Furthermore, the dissertation has studied the effects on the wind vibration response of different sections and different heights. The results show that with the increasing of the aspect ratio, depth-width ratio and the height of building, the dynamic response of the across-wind is increased. And by changing the fundamental frequency of structure, the effects on the across-wind vibration response has been analyzed. Finally, the responses have been compared with the corresponding across-wind vibration response calculated by the spectrum of Japanese load code.