分体双箱梁断面涡激振动性能及优化是大跨桥梁抗风设计面临的关键问题之一。以某大跨度悬索桥为背景，针对分体双箱梁制作节段模型进行风洞试验，分析不同攻角时主梁涡激振动性能，提出在开槽两侧沿主梁纵向对称布置气动格栅的优化方案，研究主梁开槽两侧格栅的透风率对涡激振动性能影响规律。结果表明：阻尼比0.25%，攻角-3°、0°和+3°时，主梁竖向涡激振动的无量纲最大振幅分别为0.032、0.033、0.023；攻角0°和-3°时，主梁扭转涡激振动最大振幅分别为0.18°、0.13°。开槽处布置透风率50%的两侧格栅后，主梁竖向涡激振动消失。这是由于气流在上游断面迎风侧前缘及栏杆处发生分离，产生较大尺寸的上部旋涡，随着旋涡不断运动，与下游断面发生碰撞，同时主梁尾流产生交替脱落的旋涡，诱导分体双箱梁断面发生涡激振动。开槽两侧布置两侧格栅后，气流的分离作用被弱化，在开槽位置处旋涡尺寸明显减小，减弱对下游断面的作用，优化主梁的涡激振动性能。研究可为分体双箱梁抗风设计提供参考。
Abstract
The vortex-induced vibration (VIV) performance of the twin-box girder and its corresponding mitigation measures are one of the crucial issues faced in the wind resistance design of long-span bridges. As an example, a detailed investigation and analysis were conducted on a long-span suspension bridge. Relying on sectional model wind tunnel testing, the effects of wind attack angles on VIV performance of a twin-box girder were examined. Comprehensive optimization strategies for enhancing the VIV performance of twin-box girder sections are presented, that is the grid plates are positioned at two sides of the opening slot, which are along the longitudinal direction of the main girder. Moreover, a thorough investigation was conducted, to understand the influence law of the opening slot ratio on VIV performance. The results show that, when the damping ratio is 0.25%, the main girder appears vertical VIV and the dimensionless maximum amplitude is 0.032, 0.033, 0.023 at wind attack angle -3°, 0° and + 3°, respectively. At wind attack angle 0° and -3°, the maximum torsional VIV amplitude is 0.18° and 0.13°. The vertical VIV ceases to exist when the opening ratio of the grid plates reaches 50% and the grid plates are positioned on two sides of the opening slot. This is because, the air flow is separated at the leading edge of the windward side of the upstream section, resulting in the upper vortices with large size and pound on the downstream section with the movement of vortices. The Alternatively shedding vortices are arisen at the tail of the main girder and finally induces the VIV. After the arrangement of the grid plates, the grid plates reduced the separation of the airflow. Vortices with certain size are still be generated at the opening slot, while the size of vortices is significantly reduced. Simultaneously, the grid plates cause the vortices to be detached from the upper and lower parts of the girder section, reducing the impact on the downstream area, thereby enhancing the VIV performance of the main girder. The research conclusions could provide reference for the wind-resistant design of other twin-box girder sections.
关键词
分体双箱梁 /
风洞试验 /
涡激振动 /
格栅 /
绕流结构
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Key words
Twin-box girder section /
wind tunnel testing /
vortex-induced vibration /
non-uniform grid plate /
flow structure
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