圆形土楼屋盖风荷载的数值模拟分析

Numerical Simulation of Wind Pressure on the Roof of Circular Earth Building

采用数值模拟方法,在具有不同坡角和高径比情况下,对圆形土楼的屋盖极值风压系数和净风压系数进行参数分析,探讨屋面坡角和高径比对客家圆形土楼屋盖风荷载的影响.采用剪切应力输运(SST)k-ω湍流模型,建立具有代表性的单体圆楼振福楼的数值风洞模型,得到屋盖极值风压系数和净风压系数随坡角、高径比变化的分布曲线.结果表明,综合考虑两种风压系数和风流场的影响,圆形土楼抗风效果较好的坡角为45°,而高径比是0.24.

To investigate effects of roof gradient and height-diameter ratio upon the wind loads on the roofs of Hakka circular earth building,a series of parametric analyses were carried out on the roof extreme wind pressure coefficient and net wind pressure coefficient by means of numerical simulation.Using SST k-ω turbulence model,a typical model of single circular earth building ＂Zhen-fu building＂ is established.The roof extreme wind pressure coefficient and net wind pressure coefficient distribution curves for circular earth buildings with various roof gradients and height-diameter ratios were obtained.It′s indicated that the optimal roof gradient of circular earth building to resist wind load is 45°,and the optima height-width ratio is 0.24.