局部开洞的落地四坡房屋表面风压分布研究

Wind pressure distribution of landing hipped camping house with local opening

为研究局部开洞的落地四坡房屋表面风压分布,基于流体动力学和大气边界层基本理论,运用FLUENT软件并借助开洞TTU标准模型的现场实测试验数据,分析与探讨了数值风洞尺寸、离散格式、求解算法、网格划分技术等关键参数及技术,建立了开洞落地四坡房屋的数值风洞。在此基础上,以洞口大小、洞口位置及单面、多面开洞为分析变量,进行了59种开洞房屋工况表面风压分布数值模拟,得到了各变量对房屋表面风压分布,提出了整体结构抗风设计的风荷载体型系数。分析结果表明:开洞对落地四坡房屋风压分布影响显著,风压数值变化大,甚至出现正负压交变;迎风面单面开洞时最为不利,屋盖的风压系数峰值高达-1.24,设计及使用时应引起足够的重视。

To study the distribution of wind pressure on the surface of lightweight folding landing hipped camping house with local opening, numerical investigations on TTU model with local opening are carried out by using FLUENT which is based on the fundamental principles of fluid dynamics. The mesh rezoning pattern, the mesh size and turbulence model in the numerical simulation are determined according to the results of the field measurements. By taking the hole size, hole location and hole pattern as parameters, the distribution of wind pressure on the surface of folding landing hipped house under 59 different sets of conditions is calculated where the distribution regularity of flow field, wind pressure distribution characteristics can be obtained and the net wind load shape coefficient is raised. It can be found from the results that the local opening has significant influences on the wind pressure. When open one side hole, the windward side is most unfavorable and the wind pressure coefficient of roof peak is-1.24, which should be paid more attention when the house is designed and used.