Wind pressure and wind field characteristics around long cantilever annular roofs

Wind pressure and wind field around long cantilever annular roofs were simulated numerically by using commercial software FLUENT and k-e turbulence model.The effects of key parameters such as the coming wind direction,roof angle,ventilation rate,openings on the roof,and cornice on wind pressure distribution around the roof were analyzed,and the effects of vertical aerodynamic control plates fixed to and openings along the roof's out-edge on wind pressure distribution of annular roof were investigated.The results show that the negative wind pressure occurs on the upper surface of horizontal roof under any coming wind angle,and higher negative pressure always appears at the out-edge of the roof.The optimal inclination angle of roof should be among the range of 0°~15°.The increase of ventilation rate on windward surface of structural system can reduce mean wind pressure on the horizontal roof,while roof cornice has little influence on wind pressure.Both vertical aerodynamic control plates fixed to the roof and openings along the perimeter of the roof can obviously reduce wind pressure of horizontal roof effectively.