Wind tunnel test for wind pressure distribution on stadium canopy under typhoon wind field

High turbulence and strong variability of typhoon wind field have great influence on long span structures.Rigid model wind tunnel tests under conventional terrain B wind field and typhoon wind field were performed to a 1∶ 300 scale model of a stadium canopy for investigating the wind pressure distribution.Based on test data,overall wind pressure statistical distribution and lifting force of the stadium canopy were discussed.Moreover,a detailed comparative study was conducted towards typical measured section in typical wind azimuths to present the wind pressure distribution principle and mutual relationship under two types of wind field.Essential conclusions are as follows.Under the two types of wind field,mean wind pressure distributions are similar,the lifting force on the whole roof in all wind azimuths under typhoon wind field is larger than that of terrain B wind field by 8%~25%.Calculated from peak negative wind pressure,the lifting force under typhoon wind field is larger than that of terrain B wind field by 27%~46%.The peak wind pressure under typhoon wind field is significantly greater than the corresponding values under conventional terrain B wind field with the average ratio of about 1.13~1.70.Test results prove the high turbulence characteristic of typhoon wind field and show the necessity to consider the fluctuating wind pressure magnification effect on stadium design in typhoon-prone regions.