轻型折叠落地四坡野营房屋表面风压分布分析

为了研究轻型折叠落地四坡野营房屋在风作用下表面风压分布特性,基于计算流体动力学和大气边界层基本理论,运用计算流体力学软件Fluent,参考现场实测和风洞试验结果,对落地四坡野营房屋进行数值模拟基础性研究,确定网格划分方式、网格数量及湍流模型等技术及基本参数。在此基础上:以风向角和落地坡角为参数,进行了24种工况下落地四坡房屋表面风压分布的数值计算,得到房屋表面风压分布特性及风荷载体型系数;用影响建筑气动外形的表面各区体型系数为参数,以对建筑表面作用最小为目标进行体型优化,得到合理体形的建筑落地坡角为60°~72°(屋脊角为132°~140°)。研究结果可为落地四坡房屋的抗风设计及体型优化提供理论依据。

Analysis of wind pressure distribution on surface of lightweight folding landing hipped camping house

To study the distribution of wind pressure on the surface of lightweight and folding landing hipped camping house under wind loads, numerical investigations on landing hipped camping house under steady wind fields were carried out using the CFD(computational fluid dynamics) software Fluent based on the theory of atmospheric boundary layer. The mesh rezoning pattern, the mesh size and turbulence model in the numerical simulation were determined according to the results of the field measurement and wind tunnel test. Considering the wind directions and the ground slope angle of folding landing hipped house as parameters, the distribution of wind pressure on the surface of folding landing hipped house under 24 different conditions were calculated where the distribution regularity of flow field and thus wind pressure distribution characteristics,shape coefficient could be obtained. With the aim of minimizing the shape coefficient on the surface partition of building aerodynamic shape which reflects the influence of wind pressure on architectural surface, the optimization analysis of structure shape was conducted and then the rational shape building floor slope angle of 60°~ 72°(Roof angle of 132°~140° ) was obtained. The results can provide reference for wind-resistant design of landing hipped house and the optimization design of the shape.