Experimental Study of Wind Loads on Inverted Umbrella-Shape Canopies Group

Based on an actual structural project,a wind tunnel test of 26 inverted umbrella-shape structures was carried out in TJ-3 boundary layer wind tunnel in Tongji University.The wind loads on the structures(canopies)were analyzed in detail according to the test results,such as the mean and root-mean-square(rms)pressure coefficients,area shape coefficients and overturning moment coefficients in some typical wind directions.The wind pressure distribution characteristic on the upper and lower surfaces and the net pressures of the canopies,as well as the worst wind direction were also discussed.Meanwhile,the aerodynamic interference effects between 26 canopies group structures were also studied.The results show that the wind loads on canopies are mainly negative pressures acting upward,and the canopies will bear high overturning moment in some cases,and the canopies at the end and the higher location will suffer greater wind loads,which should be paid attention.