福建圆形土楼悬挑屋盖风荷载特性及气动抗风措施研究OA北大核心CSTPCD

The cantilevered roofs of Fujian circular Tulou are structures that are sensitive to winds,lo-cated in China's typhoon-prone areas.In order to improve the structures'resistance to wind disasters and ensure its wind-resistant safety,CFD numerical simulation was conducted to study the wind load distribution characteristics on the roofs.Aerodynamic measures to enhance wind resistance were pro-posed.The results showed that wind pressure on the windward side of the roofs was relatively large,and the absolute wind pressure coefficients at the ends of both the inner and outer cantilevered roofs,which were sensitive to wind loads,were the largest,reaching 1.5 and 0.75,respectively.The addi-tion of vertical or corrugated wind deflectors at the ends of the outer cantilevered roofs could mitigate the wind pressure on these sensitive parts to a certain extent.Generally,corrugated wind deflectors had a better effect on unloading wind pressure than their vertical counterpart.For corrugated wind de-flectors,when their relative height h/Hj=0.05(h being the height of the wind deflector and Hj being the distance from the ground to the roof ridge),inclination angle θ=45°,and corrugated arc radius R=5.5 m,the wind pressure unloading effect on the roof surface was the best.The wind pressure co-efficients at the ends of both the inner and outer cantilevered roofs were reduced by 40.1%and 54%,respectively.The corrugated design of the wind deflectors effectively blocked incoming wind flow to the cantilevered roofs,causing vortices formed by air flow impact to shift from the roof ends to the de-flector surface.Furthermore,the corrugations reduced the intensity of air flow vortices on the surfaces of both inner and outer cantilevered roofs,thereby efficiently unloading the wind load.