Mechanism of the Influence of Railing Cornerstone on Vortex-induced Vibration of Closed Box Girder Bridge

被引：0
|
作者：
Li C.-G. [1 ]
Zhang J. [1 ]
Han Y. [1 ]
Yan C. [1 ]
机构：
[1] School of Civil Engineering, Changsha University of Science & Technology, Changsha, 410114, Hunan
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2019年 / 32卷 / 10期
关键词：
Bridge engineering; Closed box girder; Mechanism of vortex-induced vibration; Railing cornerstone; Surface pressure; Wind tunnel test;
D O I：
10.19721/j.cnki.1001-7372.2019.10.014
中图分类号：
学科分类号：
摘要：
In order to investigate the influence of railing cornerstone on the vortex-induced vibration (VIV) performance of a bridge, taking a super long-span closed box girder suspension bridge with main span 808 m as engineering background, a wind tunnel test was conducted to obtain the VIV response and pressure time-history data from pressure measurement points on a large-scale section model. The VIV performance of the originally designed cross-section at an attack angle of ±5° was tested. The mean value, mean square deviation, pressure power spectrum, and correlation between the local aerodynamic force and overall aerodynamic force of the bridge-deck measurement points under three different working conditions were compared and analyzed. The results show that significant vertical and torsional VIV occurred in the designed section of the main girder, and the torsional VIV significantly exceeded the allowable value of the code. The VIV performance of the main girder decreased with increasing angle of attack of incoming wind. The analysis of measured fluctuating pressure data on the main girder surface showed that, owing to the barrier of railings and cornerstones, the air flow on the upper surface of the box girder separated and then attached to the back, resulting in strong pressure fluctuations at the front, middle, and rear parts of the upper surface. The research results indicated that the fundamental cause of torsional VIV is the strong pressure fluctuations at the front and rear of the upper surface of the girder. The local aerodynamic forces of the oblique web in the windward zone of the upper surface, the rear, and lower surface are strongly correlated with the overall aerodynamic forces. The pressure fluctuations on the upper and lower surfaces were significantly reduced by moving the railing cornerstone to the edge of the bridge deck. The aerodynamic correlation between the front and rear parts of the upper surface is destroyed, which can greatly suppress the VIV. With the reduction of railing cornerstone height, the reattachment to downstream regions of the upper surface was enormously restrained. The pressure fluctuations in the section was weakened, and the correlation between local aerodynamic force and overall aerodynamic force is completely destroyed, thus effectively suppressing the VIV. © 2019, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：150 / 157
页数：7
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