四坡屋面低矮建筑风载体型系数研究

摘要

基于雷诺平均方法（RANS ）和剪切应力输运（SST ） k-ω湍流模型，对低矮房屋的四坡屋面风压体型系数进行了数值计算。以美国德克萨斯州理工大学的TTU（Texas Tech University）建筑模型为验证算例，求得其屋面风压分布，与其他文献的结果进行对比吻合较好，验证了所选湍流模型及其参数的合理性。基于此方法研究不同风向角下，房屋外形参数（坡角与檐口）对四坡屋面风压体型系数的分布影响，并总结出屋盖风压体型系数变化的规律，为此类建筑抗风设计提供参考。%Based on Reynolds-averaged Navier-Stokes and SST k- ωturbulence model ,the wind pressure on the hip roof of low-rise buildings is simulated and calculated in the paper .Firstly ,the shape coefficient on the roof of TTU (Texas Tech University ) low-rise building model is investigated with numerical simulation technique .Compared with other exist-ing data ,the reasonable agreement between the numerical results and previous data confirms that the computational reso-lution here is reliable .Then ,the effects of the building ’s shape parameters (pitch and eaves ) upon the shape coefficients on the roof of low-rise buildings are analyzed by using numerical simulation under different wind directions .Simultane-ously ,the change rule of the roof shape coefficient with respect to the shape parameters is summarized ,providing a refer-ence for the wind-resistant design of the low rise buildings with hip roof .