WIND PRESSURE DISTRIBUTION ON THE RETRACTABLE ROOF OF NEW NATIONAL TENNIS CENTER

摘要

Due to the retractable roof of New National Tennis Center is light,flexible,and low damping,it is prone to wind and wind load is one of the most important loads to control the structural design. In the presented paper,studies on the wind pressure distribution on the retractable roof of New National Tennis Center in opening and closing have been carried out,including the mean wind load and the fluctuating wind load,by using High Frequency Pressure Integration (HFPI) wind tunnel test and Computational Fluid Dynamic (CFD) numerical simulation techniques. The mean wind-induced pressure depends on the surface shape and the state of the retractable roof. The variety of the roof surface will result in the shape coefficient dramatic change. However,it should be mention that the maximum shape coefficient locates on different areas when the retractable roof is in different state. The probability distribution density of wind-induced pressure acting on the retractable roof does not satisfy the Gauss distribution and is sharper than that of the Gauss distribution,which shows the pulse effect of wind pressure is significant. Distribution of the root-mean-square of wind-induced load relates to that of the shape coefficient,and the maximum root-mean-square locates on the areas in where the shape coefficient changes dramatically. Based on the distribution of the mean and fluctuation wind-induced pressure,mechanisms are provided from the point of view of bluff aerodynamics.