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大跨度公铁双层斜拉桥主梁涡激共振机理与控制
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Mechanism and Control on Vortex-induced Vibration of Main Deck of Long-span Cable-stayed Bridge with Double-level Decks for Highway and Railway
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    摘要:

    以拟建的某主跨808 m公铁双层斜拉桥为工程依托,采用节段模型风洞试验研究不同攻角下双层桁架梁断面的涡振性能及5种气动控制措施的抑振效果,结合计算流体动力学(CFD)静态绕流模拟,对比分析双层桁架梁断面的涡振机理及控制方法. 研究表明:主梁断面原设计方案在+3°和0°风攻角下存在明显的竖向和扭转涡振现象,且振幅超过规范允许值;间隔封闭上层桥面栏杆或增设抑流板可有效抑制主梁扭转涡振,但竖向涡振振幅仍不满足规范要求;上弦杆外侧增设风嘴可有效抑制主梁竖向和扭转涡振,而下弦杆外侧增设风嘴对主梁涡振抑振效果有限. 气流经主梁原设计断面上层桥面分离后,在其上下表面形成周期性脱落的大尺度旋涡,并在上层桥面后部再附,这是主梁发生竖向涡振的主要诱因;上弦杆外侧增设风嘴可引导气流平稳通过上层桥面,消除了周期性的旋涡脱落,并在其上表面形成一段狭长“回流区”,从而有效抑制了涡振的发生.

    Abstract:

    Based on a cable-stayed bridge with a main span of 808 m and double-level decks for highway and railway, the vortex-induced vibration (VIV) performance of the double-level decks of truss girder section under different wind attack angles and the vibration suppression effects of five aerodynamic control measures were studied by the section model wind tunnel tests. Combined with the static flow simulation via computational fluid dynamics (CFD), the VIV mechanism and control method of the double-level deck truss girder section were compared and analyzed, respectively. The research results show significant vertical and torsional VIV of the original main deck at +3° and 0° wind attack angles, and the amplitudes exceed the allowable values of the code. The torsional vortex vibration of the main girder can be effectively suppressed by enclosing the upper deck railings at intervals or adding flaps. However, the amplitude of the vertical VIV of the main girder exceeds the allowable values of the code. Furthermore, adding wind fairing at the outside of the upper chord can effectively suppress the vertical and torsional vortex vibration of the main girder. However, the main girder vortex vibration cannot be effectively suppressed by adding the wind fairing at the outside of the lower chord. Moreover, after the air flow is separated from the upper deck of the original design section of the main girder, periodic large-scale vortex shedding on its upper and lower surfaces is formed, and then attached to the rear of the upper deck, which is the main cause of the vertical VIV of the main girder. The wind fairing located at the outside of the upper chord can guide the airflow smoothly through the upper deck, eliminating periodic vortex shedding. Additionally, an along and narrow reattachment zone is formed on its upper surface. As a result, this effectively suppresses the VIV of the main deck.

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LIU Zhiwen?,ZHOU Wei, LIU Zhenbiao, YAN Aiguo, XIA Zhengchun, CHEN Zhengqing.大跨度公铁双层斜拉桥主梁涡激共振机理与控制[J].湖南大学学报:自然科学版,2024,(1):1~13

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  • 在线发布日期: 2024-01-16
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