【摘要】 为探讨屋面坡角和房屋高宽比对低层双坡屋面房屋的屋面风荷载的影响,采用数值模拟方法并结合足尺模型测试的验证,对一系列具有不同坡角和高宽比情况的双坡屋面房屋的屋面风压分布进行了参数分析.利用基于Reynolds时均方程和可实现的k-ε湍流模型的模拟方法,得到了不同几何外形的屋面平均风压的分布曲线,总结了屋面平均风压系数随高宽比、坡角变化的基本规律.结果表明,随着屋面坡角的增大,迎风屋面的风压绝对值趋于减小,背风屋面则趋于增大,推荐坡角为15°~25°;屋面风压随房屋高宽比的增大而增大.更多还原

【Abstract】 To investigate effects of roof pitch and height-width ratio upon the wind loads on the roofs of low-rise gable-roofed buildings,a series of parametric analyses were carried out on building models with different roof pitches and height-width ratios by means of numerical simulation combining with full-scale experimental verification.The numerical simulation was based on the Reynolds-averaged equations and the realizable k-ε turbulence model. Through the parametric analyses the roof pressure distribution curves for buildings with various geometric dimensions were obtained and the variation trends of the roof pressure with respect to the roof pitch and height-width ratio were summarized accordingly.The obtained results indicated that the magnitude of the windward roof pressure tends to decrease while that of the leeward roof pressure tends to increase with the increase of roof pitch.The recommended roof pitches are 15°～25°.The magnitude of the roof pressure increases with the increase of height-width ratio.更多还原