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介绍了上海铁路南站模型风洞试验和风荷载数值模拟的主要结果。通过风洞试验,给出了这一大跨度屋盖结构在无周边建筑和有周边建筑情况下屋面的风压分布特性。总的来说,挑篷迎风前缘有较大的负压,且梯度较大;前缘中部压力系数接近零;屋盖顶部又呈现负压状态;屋盖背风处一般是正压。同时,基于CFX5.5软件平台,利用RSM湍流模型,对屋盖上的平均风压进行了数值模拟,并将计算结果与测压模型风洞试验数据进行了对比。对比结果显示两者较为吻合。此外,通过降低悬挑部分的高度以研究几何参数变化对平均风荷载的影响。数值模拟表明,降低悬挑高度可以显著减小悬挑部分的平均风荷载。
The main results of wind tunnel test and wind load numerical simulation of Shanghai South Railway Station model are introduced. Through the wind tunnel test, the wind pressure distribution characteristics of the roof in this long-span roof structure with no surrounding buildings and surrounding buildings are given. In general, the leading edge of the canopy has a greater negative pressure and a larger gradient; the pressure coefficient at the center of the leading edge approaches zero; and the top of the roof shows negative pressure again; and the leeward of the roof is generally positive pressure. At the same time, based on the CFX5.5 software platform, RSM turbulence model was used to simulate the average wind pressure on the roof, and the calculated results were compared with the wind tunnel test data of the piezometric model. Comparison results show that the two are more consistent. In addition, the influence of geometric parameters on the average wind load was studied by reducing the height of the overhang. Numerical simulations show that reducing the cantilever height can significantly reduce the average wind load on the overhanging part.