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<p>To improve the flutter performance of a large-span steel truss suspension bridge, the bridge flutter critical wind speed is measured directly using a sectional model vibration test, and further, the flutter optimization performance is investigated by CFD. This study shows that + 3° angle of attack is the most unfavorable case. In the most unfavorable case, the flutter critical wind speed increases with the increase of the width of the horizontal stabilizers. For the upper central stabilizers, the flutter critical wind speed in the most unfavorable case can only be significantly increased when its height reaches a certain level (0.271 times the girder height), while the lower stabilizers have almost no effect on the flutter critical wind speed in the most unfavorable case. Moving the railing position to the inside and increasing the ventilation rate of the railing can increase the critical wind speed in the most unfavorable case. In addition, the flutter suppression effect of the combined measures is much larger than the single measures. Finally, the flutter optimization performance of the section under a single different measure is investigated based on CFD, as well as the flutter critical wind speed, the energy inputs of single-degree-of-freedom torsion and vertical bending, and the streamline diagrams and pressure cloud diagrams are given in the different working conditions, to analyze the influence of different measures on the flutter critical wind speed.</p>

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Flutter performance optimization of steel truss suspension bridge using stabilizers and ancillary facilities

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Xuhui He,
  • Mingde Li,
  • Lei Yan,
  • Tongqing Lu,
  • Quancheng Duan

摘要

To improve the flutter performance of a large-span steel truss suspension bridge, the bridge flutter critical wind speed is measured directly using a sectional model vibration test, and further, the flutter optimization performance is investigated by CFD. This study shows that + 3° angle of attack is the most unfavorable case. In the most unfavorable case, the flutter critical wind speed increases with the increase of the width of the horizontal stabilizers. For the upper central stabilizers, the flutter critical wind speed in the most unfavorable case can only be significantly increased when its height reaches a certain level (0.271 times the girder height), while the lower stabilizers have almost no effect on the flutter critical wind speed in the most unfavorable case. Moving the railing position to the inside and increasing the ventilation rate of the railing can increase the critical wind speed in the most unfavorable case. In addition, the flutter suppression effect of the combined measures is much larger than the single measures. Finally, the flutter optimization performance of the section under a single different measure is investigated based on CFD, as well as the flutter critical wind speed, the energy inputs of single-degree-of-freedom torsion and vertical bending, and the streamline diagrams and pressure cloud diagrams are given in the different working conditions, to analyze the influence of different measures on the flutter critical wind speed.