Numerical Simulation On Wind Pressure And Wind-induced Vibration Of Structures In Typical Forms

With the emergence of light high-strength building material, it frequentlyhappened that space structures suffered local damages and overall collapse, whichmakes the wind load one of the control loads for the design of them. In southeastcoastland of china, Concave low-rise buildings, a typical wind sensitive structure,are widely used as industrial and civil buildings. Nowadays, large-span spatialstructures are featured with flexibility, and the fluid-structure interaction is moresignificant, For example, cable domes and stadium grandstand cantilever roofs.This paper researches into low-rise buildings, inflatable membranes, and stadiumgrandstand cantilever roofs. With software Fluent, numerical simulation on windpressure distribution around concave low-rise buildings with eaves was conducted.The influences of roof pitch,wind direction and cornice forms on mean wind pressureover the roof and the flow around the building are mainly analyzed. The numericalsimulation suggests that, the maximum negative wind pressure decreases with theincrease of the roof pitch, while the absolute value of leeward negative wind pressureincreases. When the vertical eave length is constant, The wind suction pressuredecreases with the increment of horizontal eave length, while gradually increases withthe increment of vertical eave length, when the horizontal eave length is constant.With Ansys/CFX, research on fluid-structure interaction of inflatable membranedomes and stadium flexible cantilever roofs was conducted. For the inflatablemembrane domes, the wind vibration coefficient reaches maximum at the middle ofthe windward side.The fluid-structure interaction has a significant effect on windpressure distribution pattern of grandstand cantilevered roofs, which makes theforefront area of upper surface suffer positive wind pressure, and the area withmaximum wind suction shifts1/4of the span backwards from the most forefront ofthe roof. Furthermore, suggestion was made on the value of wind vibrationcoefficients of grandstand cantilevered roofs under different wind directions.