大跨度膜结构表面平均风压的数值模拟

Numerical simulation of mean wind pressure on long-span membrane structure

风荷载是大跨度膜结构设计的控制荷载,以实际工程为背景,基于雷诺平均法,采用realizable k-ε湍流模型,运用流体分析软件Fluent 16. 0,对大跨度开敞膜结构屋盖表面风荷载进行数值模拟,分别得到各风向角下膜结构上下表面的平均风压分布,总结其风压分布特点,整合得到整体总风荷载分布。并且考虑周围建筑物干扰,对比分析各风向角下,周围建筑物对膜结构上下表面风压分布的影响,为设计人员提供参考。

Wind load is the control load for membrane structures. Based on a practical project,a realizable k-ε model,the Reyonolds Averaged Navier-Stoke Equations turbulence model,is added to a commercial computational fluid dynamics software Fluent 16. 0 to numerically simulate the wind flow field around the long-span membrane structure. In different wind directions,the mean wind pressure on the up and down faces can be simulated in this method and the total mean wind pressure distribution can be calculated. Furthermore,an extra model with the surrounding building is established to simulate the wind pressure. By comparing the two model,the influence of the surrounding building on the mean wind pressure is summarized. The result provides a reference to the design of this type building.