方形土楼屋盖风荷载的数值模拟分析

为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,应用数值模拟方法,在不同方向角下分别对不同的坡角和高宽比情况下土楼的屋盖极值风压系数和净风压系数进行参数分析,采用SSTk-ω湍流模型,建立具有代表性的单体方楼德辉楼的数值风洞模型,得到了屋盖极值风压系数和净风压系数随坡角、高宽比变化的分布曲线.综合考虑2种风压系数和风流场的影响,结果表明：方形土楼抗风效果较好的坡角为45°,而高径比是0.45.

Numerical Simulation Analysis of Wind Pressure on the Roof of Square Earth Building

To investigate effects of roof pitch and height-width ratio upon the wind loads on the roofs of Hakka square earth building, a series of parametric analyses were carried out on the roof extreme wind pressure coefficient and net wind pressure coefficient of square earth building with different roof pit- ches and height-diameter ratios of different wind direction by means of numerical simulation. This ar- ticle constitutes a typical monomer model： Square Earth Building named ＂Dehui building＂ by using SST k-w turbulence model. And the roof extreme wind pressure coefficient and net wind pressure coef- ficient distribution curves for Square Earth Buildings with various roof pitches and height-width ratios were obtained. To consideration the affect of two wind pressure coefficient and wind flow. The ob- tained results indicated that the best wind resistance of roof pitch of square earth building is 45and height-width ratio is O. 45.