Effects of Reynolds number and scale ratio on VIV tests for railway blunt box girders.

IF 3.8 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Scientific Reports Pub Date : 2025-05-31 DOI:10.1038/s41598-025-02621-8

Damei Tuo, Guosheng Zeng, Yi Zhang, Meili Liao

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引用次数: 0

Abstract

Blunt steel box girder as a form of main girder used in large-span railway bridges, the vortex-induced vibrations (VIVs) phenomenon is significant. In order to investigate the effect of model scale on the test results of section model VIV tests of railway bridge blunt box girders, 1:90, 1:50 and 1:25 section model wind tunnel tests were carried out. The test results show that the VIV experimental results are greatly affected by the scale of the model, in which the amplitudes obtained from the 1:50 model test is the most significant, and the VIV characteristics of the two scale models of 1:50 and 1:25 coincide with each other roughly; However, the 1:90 small-scale model is not able to effectively respond to the VIV characteristics of the real bridge. The CFD numerical simulation results also confirm the phenomenon that the 1:90 small-scale model test cannot effectively respond to the real VIVs characteristics. Although VIVs, obtained in a small-scale model test, are not possible to determine the vibration response of the actual railway bridge, it can be used to compare the VIV performance of the cross-section and to assist in the study of aerodynamic optimization measures at the early design stage.

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雷诺数和尺度比对铁路钝箱梁涡激振动试验的影响。

钝钢箱梁作为大跨度铁路桥梁主梁形式，其涡激振动现象十分明显。为了研究模型比例对铁路桥梁钝箱梁截面模型涡振试验结果的影响，分别进行了1:90、1:50和1:25截面模型风洞试验。试验结果表明：模型比例尺对涡激振动试验结果影响较大，其中1:50比例尺模型试验得到的幅值影响最为显著，1:50和1:25比例尺模型的涡激振动特性基本一致；然而，1:90的小尺寸模型并不能有效地响应真实桥梁的动频特性。CFD数值模拟结果也证实了1:90小尺寸模型试验不能有效响应真实涡扇特性的现象。虽然在小尺度模型试验中获得的涡激VIV无法确定实际铁路桥梁的振动响应，但可以用于比较截面的涡激VIV性能，并有助于设计初期气动优化措施的研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scientific Reports Natural Science Disciplines-

CiteScore

7.50

自引率

4.30%

发文量

19567

审稿时长

3.9 months

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