带檐口曲面双坡屋面风压数值模拟  

Numerical simulation of wind pressure on concave gable roof with cornice

作　　者：孙颖昊[1] 周岱[1] 陈怡然[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《空间结构》2013年第1期41-49,共9页Spatial Structures

基　　金：国家自然科学基金资助项目(51078230;11172174;51278297);上海市基础研究重点资助项目(10JC1407900)

摘　　要：基于Fluent软件平台,选用基于Reynolds平均法的RNGk-ε湍流模型,对低矮带檐口的曲面双坡屋面房屋周围风场和表面风压开展数值模拟,研究了屋面坡度、房屋高度、跨度、长度和房屋檐口类型等各种参数对曲面双坡屋面风压系数的影响.研究表明,曲面双坡屋面风压受房屋几何尺寸影响不明显,而受屋面坡度、房屋檐口类型影响明显,且与来风风向角密切相关.屋面风压随房屋高跨比的增大而增大;随屋面坡度增大,迎风面风压绝对值减小,而背风面则增大.竖向和水平檐口显著影响曲坡屋面的风压大小和分布.A renormalization group κ-ε model based on the Reynolds Averaged Navier-Stokes Equations （RANS） turbulence model is added in software Fluent to numerically simulate wind pressure distribution and the wind flow field around a concave low-rise building with eaves. A detailed parametric study is performed for average wind pressure coefficients of low-rise building with eaves. The parameters include roof pitch, wall height, wall width, wall length and cornices forms. The numerical results show that the wind pressure over roof is not affected by the geometry dimensioning of building significantly. Wind attack angle, roof pitch and cornices forms affect both the magnitude and distribution of wind pressure over gable roof. Wind pressures over the roof increase with the increasing of height-width ratio, where wind pressures over windward roof decrease while those over leeward roof increase with the increasing of roof pitch. Furthermore, both vertical and horizontal cornices change greatly the wind pressure distribution around the roof.

关 键 词：低矮房屋曲坡屋面 数值模拟 风压 抗风优化 

分 类 号：TU312.1[建筑科学—结构工程] V211.3[航空宇航科学与技术—航空宇航推进理论与工程]