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| 宽幅分体式双钢箱梁涡振性能试验研究 |
| Experimental Study on Vortex-Induced Vibration Performance of a Wide-Deck Split-type Twin Steel Box Girder |
| 投稿时间：2023-08-04 修订日期：2023-10-27 |
| DOI： |
| 中文关键词: 分体式钢箱梁 涡振性能 风洞试验 气动措施 |
| 英文关键词:split-type steel box girder vortex-induced vibration performance wind tunnel test aerodynamic countermeasures |
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| 中文摘要: |
| 近年来,分体式钢箱梁作为新的主梁断面形式,因其优异的颤振稳定性备受青睐。然而,由于其特殊结构,其涡振性能的研究仍有待深入。本文以某大桥的宽幅分体式双钢箱梁为研究对象,通过1/60比例主梁节段模型进行风洞试验研究,研究了均匀流和紊流场下原始断面的涡振特性和附加气动措施(如检修车轨道位置、封闭栏杆、中央开槽处挡风格栅和中央盖板等)对分体式双钢箱梁的涡振控制效果。研究结果显示,分体式双钢箱梁中央开槽处对气流的影响是产生涡激振动的重要因素。紊流场对抑制扭转涡振有明显效果,但对竖向涡振的抑制效果有限。改变检修车轨道位置和封闭栏杆等气动措施对扭转涡振的抑制效果不明显,但对抑制竖向涡振有一定效果。中央开槽处的挡风格栅和中央盖板透风率越低,涡振抑制效果越显著,并且中央开槽处抑振措施的高度设计对抑振效果也有一定的影响。本研究成果可为类似分体式钢箱梁的抗风设计提供参考,进一步优化其涡振性能。 |
| 英文摘要: |
| In recent years, split-type steel box girders have gained popularity as a new form of main girder cross-section due to their excellent flutter stability. However, due to their unique structure, further research is needed on their vortex-induced vibration (VIV) performance. This study focuses on the wide-deck split-type twin steel box girder of the Binhai Bay Bridge in Dongguan city. Wind tunnel tests were conducted on a scale of 1/60 sectional model to study the VIV performance of original design and the effectiveness of aerodynamic measures under uniform flow and turbulent flow conditions. These measures included the position of the inspection vehicle track, closed guardrails, wind barriers and cover plate at the central slot. The results showed that the influence of the airflow at the central slot of the split-type twin steel box girders is a significant factor in generating vortex-induced vibrations. Turbulent flow has a noticeable effect on suppressing torsional VIV but has limited impact on vertical VIV suppression. Aerodynamic measures such as changing the position of the inspection vehicle track and closed guardrails has insignificant effects on suppressing torsional VIV but shows some effectiveness in suppressing vertical VIV. Wind barriers and cover plate with lower permeability at the central slot exhibited more significant suppression of VIV. The height of the vibration suppression measures in the central slot also has a certain influence on the vibration suppression effect. The findings of this study can provide references for wind-resistant design of similar split-type steel box girders to further optimize their VIV performance. |
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