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以洞庭湖大桥桥塔(主塔)为研究对象,基于Fluent软件平台,模拟了主塔塔顶表面的风压分布。采用3种不同的湍流模型对主塔塔顶进行数值模拟,并将模拟结果与实测试验结果进行了对比。选取合理的湍流模型;并探讨了不同风速及不同风向角对主塔塔顶表面风压分布的影响。结果表明,3种模型模拟的结果均与实测试验结果变化趋势一致,而Realizable k-ε模型的模拟结果更接近于实测试验结果;不同风速对主塔塔顶迎风面及侧面风压系数影响较小,而对其背风面风压系数有较明显影响;不同风向角对主塔塔顶风压系数影响显著,尤其是对其拐角处。研究结论可供湖区复杂高耸结构的抗风设计参考。
Taking Dongting Lake bridge tower (main tower) as the research object, based on the Fluent software platform, the wind pressure distribution on the top surface of the main tower was simulated. Three different turbulence models were used to simulate the top of the tower and the simulation results were compared with the experimental results. The reasonable turbulence model is selected, and the influence of wind speed and wind direction on the wind pressure distribution on the top of the main tower is discussed. The results show that the simulation results of the three models agree well with the experimental results. The simulation results of the Realizable k-ε model are closer to the experimental results. The effect of different wind speeds on the windward and side wind pressure coefficients While the wind pressure coefficient of leeward surface has a more obvious effect. The different wind direction angle has a significant influence on the wind pressure coefficient of the main tower, especially at the corner. The conclusion is available for wind-resistant design of complex towering structures in the lake area.