不同屋面坡度温室表面风压的数值模拟  

Numerical simulation of wind pressure on greenhouses with different roof pitches

作　　者：雷隽卿[1] 李保明[1] 

机构地区：[1]中国农业大学水利与土木工程学院,北京100083

出　　处：《中国农业大学学报》2007年第6期93-96,共4页Journal of China Agricultural University

基　　金：北京市教育委员会都市农业学科群建设项目(XK100190553)

摘　　要：探讨双坡面温室屋面坡度对温室结构表面风压分布的影响。基于标准κ-ε模型方程和壁面函数法，采用有限元方法对温室结构模型进行离散，利用有限元分析软件ANSYS对不同坡度的双坡面温室表面风压进行数值模拟，对得到的风压分布曲线进行分析。结果表明：当屋面坡度由0°增加到30°时，迎风屋面的风压（风吸力）系数由0.62减小到0．15，背风屋面风压系数由0.58增大到0.66。由于屋面风吸力过大是导致屋面破坏的主要原因，推荐温室屋面坡度采用20°～30°，此时迎风屋面的风压系数（0.28～0.15）及背风屋面的风压系数（0.64～0．66）均较小，满足温室生产及通风要求。To study the influence of different roof pitches on the wind pressure of the surface of greenhouses with double-pitch roof, based on turbulence κ-ε model and wall function method, greenhouse structures were dispersed by member FEM. The wind pressure on greenhouse structures of different roof pitches was simulated by using the FEM analysis software-ANSYS, the wind pressure distributing curves were obtained and the rule of wind pressure coefficient with roof pitch was summarized, Through the simulations and analysis, the result showed that the windward roof pressure coeffiecent decrease from 0.62 to 0.15 while that of the leeward roof pressure increase from 0.58 to 0.74 according to the increase of roof pitch, The main reason of greenhouse roof breakage was bigger wind suction, The recommended roof pitches were between 20° to 30°, because the wind pressure on both of the windward roof and the leeward roof were smaller, the need of operation and ventilation could also be contented,

关 键 词：双坡面温室 屋面坡度 风压系数 有限元 数值模拟 

分 类 号：TU312.1[建筑科学—结构工程]