Abstract The aerodynamic loads on the overhead bridge bottom surface induced by train passage are reported in this paper. Both moving model test and numerical simulation approaches at the 1:20 scale are used. The numerical work is validated through both mesh independence tests and comparison with experimental data. Typical pressure variation curves are plotted and compared with previous studies. The peak pressure values’ dependence on the Reynolds number is considered through four sets of experiments with different train running speeds. The peak pressure coefficient distribution law for the bridge bottom surface is presented. Differences in the pressure distribution in different bridge bottom areas are explained based on more detailed flow field information. The influence of the bridge height on the aerodynamic load magnitude and time interval is presented. Moreover, the application of the CEN Standard to practical engineering issues is discussed.

中文翻译：

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高速列车通过高架桥时的气动载荷

摘要 本文报道了列车通过引起的高架桥底面气动载荷。使用了 1:20 比例的移动模型测试和数值模拟方法。通过网格独立性测试和与实验数据的比较来验证数值工作。绘制了典型的压力变化曲线并与以前的研究进行了比较。通过四组不同列车运行速度的实验，考虑了峰值压力值对雷诺数的依赖性。给出了桥底面的峰值压力系数分布规律。基于更详细的流场信息解释了不同桥底区域压力分布的差异。介绍了桥梁高度对气动载荷大小和时间间隔的影响。此外，还讨论了 CEN 标准在实际工程问题中的应用。