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首页> 外文期刊>Journal of bridge engineering >Buffeting Forces on Static Trains on a Truss Girder in Turbulent Crosswinds
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Buffeting Forces on Static Trains on a Truss Girder in Turbulent Crosswinds

机译：湍流侧风中桁架桁架梁上静态列车的抖振力

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摘要

Experiments were conducted in a wind tunnel with scaled models to investigate the aerodynamic characteristics of a train on a steel truss girder. Simultaneous surface pressure measurements were conducted under two turbulent flow fields. The aerodynamic-force coefficients, aerodynamic-admittance functions, and spanwise correlation characteristics of buffeting forces on the train were examined. A mean pressure coefficient suction peak was observed at the windward roof corner, and a fairly uniform pressure distribution was observed on the leeward surface of the train. The variation of the wind angle of attack (-3 degrees to 3 degrees) and turbulent flow field had minimal effects on the spanwise correlation of buffeting forces, whereas the effects of the train position on the truss girder and spanwise distance were significant. The aerodynamic admittances of the train were found to be a function of the train position on the truss girder and turbulent flow field. The effect of the wind angle of attack (-3 degrees to 3 degrees) on the aerodynamic admittances of the lateral and lift forces was mainly in the low-frequency region. Finally, empirical expressions were proposed to facilitate engineering applications.
机译：在具有比例模型的风洞中进行了实验，以研究钢桁架梁上火车的空气动力学特性。在两个湍流场下进行了同时的表面压力测量。研究了火车上的空气动力系数，空气导纳函数以及抖振力的翼展方向相关特性。在迎风顶角处观察到平均压力系数吸力峰，并且在火车的下风面上观察到相当均匀的压力分布。风的迎角（-3度到3度）和湍流场的变化对抖振力的翼展方向相关性影响最小，而列车位置对桁架梁和翼展方向距离的影响显着。发现火车的空气动力学导纳是火车在桁架梁上的位置和湍流场的函数。风的迎角（-3度至3度）对侧向力和升力的空气动力学导纳的影响主要在低频区域。最后，提出了经验表达以促进工程应用。

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