低层双坡房屋屋面平均风压影响因素的数值模拟研究

采用Fluent6.0软件平台和雷诺应力模型(RSM),对我国沿海地区常见的一类带挑檐的低层双坡房屋屋面风压进行了数值模拟,研究了各影响因素对屋面平均风压的影响。首先,将数值模拟结果和模型风洞试验结果进行对比,以说明文中采用的湍流模型和计算参数的适用性。然后,采用数值模拟方法,研究带挑檐的低层双坡房屋屋顶具有不同外形参数(坡角、挑檐长度、檐口高度)时,屋面的局部平均风压分布特性和变化规律。结果表明,各参数对屋面风压的影响程度不一,且与风向角的影响有关。坡角对屋面风压分布的影响是整体性的,挑檐长度则只有局部性的影响,而檐口高度对整体屋面风压的影响较小。研究结果可供我国沿海地区低层房屋抗风设计参考。

Numerical simulation of effects of roof factors on mean wind pressure on gable-roofed low-rise buildings with eaves

Based on Fluent 6.0 software platform and with RSM model,the effects of roof parameters on wind pressures of gable-roofed low-rise buildings with eaves,which are common in the coastal areas of China,were investigated with numerical simulation technique.Firstly the numerically simulation results of a basic low-rise building were compared with wind tunnel test data to verify the applicability of the turbulence model and the selected parameters.The effects of key parameters,including roof pitch,length and height of overhang eaves,and wind direction on the distribution characteristics and variation law of the wind pressure on the gable roofs were then analyzed.The numerical results indicate that the roof pitch has great influence on the wind pressure,while the length of overhang eaves has only partial influence and the height of overhang eaves has very little influence on the pressure distribution.Moreover,the influence levels of different roof parameters on the wind pressure distributions are also affected by wind direction.The results can be adopted as reference of design of low-rise buildings in the coastal areas of China.