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| 带风嘴π型组合梁断面涡振性能试验及抑振机理研究 |
| Experimental study on vortex vibration performance and vibration suppression mechanism of π - shaped composite beams with wind fairing |
| 投稿时间：2023-12-06 修订日期：2024-01-29 |
| DOI： |
| 中文关键词: π型主梁断面 风洞试验 涡振性能, 气动措施 |
| 英文关键词:π-shaped grider Wind tunnel test Vortex Induced Vibration performance countermeasure |
| 基金项目:国家自然科学基金资助项目(51978087，51822803), |
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| 中文摘要: |
| 为研究带风嘴π型叠合梁断面涡激振动性能,基于某在建的斜拉桥工程设计方案,通过1:50缩尺比刚性节段模型自由悬挂风洞试验,测试了不同工况下π型梁的涡振性能,并对稳定板、封闭栏杆等不同气动措施的抑振效果进行了研究。进一步,采用SST k-ω湍流模型,模拟了原断面和推荐措施下π型梁断面周围的流场特性,并结合绕流涡量演化图探讨了涡振抑制机理。研究结果表明：原断面在五种风攻角状态下均发生明显竖向涡激振动,且+5°攻角竖向幅值超过规范允许振幅。设置与边主梁等高的下中央稳定板明显降低了涡激振动响应,主梁涡振性能虽下中央稳定板高度先提升后降低。 |
| 英文摘要: |
| In order to study vortex-induced vibration (VIV) performance of π-shaped composite beams with wind fairing, based on the design scheme of a cable-stayed bridge under construction, the VIV performance of the π - shaped beam under different working conditions was tested through a 1:50 scale rigid section model free suspension wind tunnel test. The vibration suppression effects of different aerodynamic measures such as stable plates and closed railings were also studied. Furthermore, SST k- ω turbulence model was used to simulate the flow field characteristics around the original section and the recommended measures of the π - shaped beam section, and the vortex suppression mechanism was explored in conjunction with the vortex evolution diagram of the surrounding flow. The research results indicate that the original cross-section undergoes significant vertical VIV under five different wind attack angles, and the vertical amplitude of the+5 ° attack angle exceeds the allowable amplitude in the specifications. The setting of a lower central stable plate at the same height as the edge main beam significantly reduces the vortex induced vibration response. |
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