落地四坡野营房屋风压分布特性及体型优化研究  

Wind pressure distribution characteristics and shape optimization of landing camping houses with hipped roof

作　　者：颜卫亨[1] 武艳如[2] 吴东红[3] 徐研[1] YAN Wei-heng;WU Yan-ru;WU Dong-hong;XU Yan(School of Civil Engineering, Chang＇an University, Xi＇an 710061, China;School of Civil Engineering, Yan ＇an Institute of Innovation, Xi＇ an 710100, China;School of Sciences, Chang＇an University, Xi＇an 710061, China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]延安大学西安创新学院,陕西西安710100 [3]长安大学理学院,陕西西安710064

出　　处：《空间结构》2018年第1期75-82,共8页Spatial Structures

基　　金：总后建筑工程研究所研究基金项目;陕西省自然科学基金项目(2004E204);中央高校科研专项资金项目创新团队项目(2013G3284016)

摘　　要：为研究落地四坡野营房屋的风压分布特性和合理气动外形,结合我国野营房屋目前使用情况和功能要求,设计出27种计算模型.基于流体动力学和大气边界层基本原理,采用流体动力学分析方法,运用FLUENT有限元分析软件,结合风洞试验结果,分析与探讨网格类型及划分方法、离散格式、计算方法及湍流模型等关键技术和参数,建立落地四坡房屋的数值风洞.以落地坡角、屋面坡角、高宽比和风向角为分析参数,运用数值风洞分析与探讨81种工况下房屋表面风压分布特性,得到其表面风压分布规律和风荷载体型系数.在此基础上,分别以风荷载的体型系数标准差最小、各区域体型系数最值接近及差值相对变化幅度降低作为优化计算指标,得到具有良好抗风性能的气动外形（合理体型）,分析表明经优化的气动外形各区域风荷载有显著下降.To study the wind distribution characters and the reasonable aerodynamic contour of landing camping houses with hipped roof,27 kinds of computational models were designed based on the service condition and functional requirement of camping houses in China.According to the fluid dynamic theory and the atmospheric boundary layer principle,numerical wind tunnels were established by finite element software FLUENT.Combined with the wind tunnel test results,some key parameters were studied including the finite element type and generation technology,the discretization scheme of computational domain,the calculation method,the turbulent flow model and so on.With the landing slope angle,the roof slope angle,the height-width ratio and the wind direction being set as variable parameters,the distribution rules of wind pressure were simulated under 81 kinds of working conditions,and shape coefficients were obtained accordingly.Based on these,the aerodynamic shape with good wind-resistant performance（reasonable shape）was obtained through setting the minimum standard deviation of shape factors,approximating most values of shape factors and lowering relative variation of differences as optimizing indexes respectively.The research indicates that the average standard values of wind load onsurface regions of the optimized houses were reduced significantly.

关 键 词：落地四坡房屋 计算流体动力学 数值模拟 风荷载体型系数 气动外形 

分 类 号：TU312.1[建筑科学—结构工程]