双层类椭球冠形大跨屋面的表面风压数值模拟

Numerical Simulation of Wind Pressures on Long-span Roof of Double Hyperellipsoidal Crowns

基于计算流体动力学(CFD)数值模拟方法,对拟建双层类椭球冠形大跨屋面进行了表面风压分析,得到了其在不同风向角下的风压分布情况和速度流场分布趋势,并进一步给出了拟建建筑在最不利工况下的风压系数分布等值线。结果表明:双层类椭球冠形大跨屋面的最大正压区出现在迎风面的近地处及上下部交界处,而最大负压区则出现在侧面的上下部交界处和顶面;上下部交界处由于形成了凹角,很容易出现最大局部正负压区块,因此在结构抗风设计时需要进行局部加强。

By the method of computational fluid dynamics （CFD ） numerical simulation , the analyses of wind-induced surface pressure of the proposed long-span roof of double hyperellipsoidal crowns were conducted .The distributing characteristics of mean wind pressure and velocity flow field in different wind directions were obtained .On that basis ,the isolines of wind pressure coefficient distribution of the proposed architecture under the most unfavorable condition were presented .The results show that the maximum positive pressure zone locates on the upwind side near the ground ,while the juncture of top and bottom on the upwind side also grows a zone of maximum positive pressure .The maximum negative pressure zone lies on the upwind side close to the top of the roof ,while a maximum negative pressure zone appears in the juncture of top and bottom on the side face .Therefore ,the juncture of top and bottom forms concave angle ,w hich leads to maximum local positive pressure zones or negative pressure zones , so local reinforcement should be considered in the design of structural wind-resistance .