中央开槽箱梁涡激共振特性及抑振措施机理研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (10) : 76-83.

论文

杨婷，周志勇

作者信息 +

Mechanism on the vortex resonance characteristics and countermeasures of the central-slotted box girders

YANG Ting，ZHOU Zhi-yong

Author information +

文章历史 +

摘要

基于大比例节段模型风洞测振、测压试验及计算流体力学（Computational Fluid Dynamic,CFD）方法进行中央开槽箱梁涡激共振特性及抑振措施机理研究。以芜湖长江公路二桥为例进行大比例节段模型风洞试验。结果显示，位于气动敏感位置内侧检修车轨道是诱发涡激共振原因。CFD数值模拟表明，流过上游断面底板的气流遭遇内侧检修车轨道阻挡，会加大上游断面尾流死水区宽度，开槽区域产生连续旋涡脱落现象，主导主梁断面涡振发生。提出将内侧检修车轨道向主梁中心线偏移一定距离方案，使上游断面流过梁底的高速气流在底板内侧转角处不受检修车轨道影响，气流分离点延后，开槽区域连续旋涡脱落现象消失。主梁断面表面静态测压试验结果显示，此时气流沿梁体外形能平稳过渡，无明显流动分离现象，上游断面底板内侧转角处负压值不会产生剧烈突变。上、下游断面整个内腹板的脉动压力减小、能量分散，无一致的卓越频率。对改进断面进行大比例节段模型涡振风洞试验，并与原型断面结果对比，证实其为有效的抑振措施。

Abstract

To study the mechanism on the vortex resonance characteristics and countermeasures of the central- slotted box girders, the large-scale sectional model vibration measurement, pressure measurement as well as CFD are employed. This paper takes a long-span cable-stayed bridge over the Yangtze River as an example to conduct the wind tunnel tests of large-scale sectional model. The test results indicate that it is the inside maintenance rails located in the aerodynamic susceptible sites that cause the vortex-induced vibration of the bridge. CFD numerical simulation results show that the upwind flow passing through the curved soffit plate will be hindered by the inside maintenance rails, resulting in an increased width of dead water region forming in the wake of upwind box (and an enlarged drag coefficient), where a periodic and intense vortex shedding phenomenon occurs due to velocity gradient, giving rise to the VIV of bridge in the end. Accordingly, the inside maintenance rails are proposed to be moved towards the center line by a certain distance, which will not yet be an obstacle to the high-speed upwind flow. Thus the flow will separate in the location far away from knuckle line and diminish the size of dead water region forming in the upwind box wake as well as prevent the periodic vortex shedding. The static pressure test results show that when shifting the inside maintenance rails, the negative mean pressure at the soffit plate knuckle line will not change dramatically ,the fluctuating pressures on the upwind and downwind inclined panels can be reduced, and the fluctuating energy will be dispersed without a consistent predominant frequency. Wind tunnel test in case of modified section are conducted and the results show that the VIV of the bridge can be suppressed completely.

导出引用

杨婷，周志勇. 中央开槽箱梁涡激共振特性及抑振措施机理研究[J]. 振动与冲击, 2015, 34(10): 76-83

YANG Ting，ZHOU Zhi-yong. Mechanism on the vortex resonance characteristics and countermeasures of the central-slotted box girders[J]. Journal of Vibration and Shock, 2015, 34(10): 76-83

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