Experimental Study on Influence of Wind Barrier Permeability on Characteristics of Main Girder Vortex-induced Vibration

被引：0
|
作者：
Li C. [1 ]
Wang L. [1 ]
Han Y. [1 ,2 ]
Li K. [1 ]
Cai C. [1 ,2 ]
机构：
[1] School of Civil Engineering, Changsha University of Science & Technology, Changsha
[2] Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, 70803, LA
来源：
Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences | 2021年 / 48卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Surface pressure; Suspension bridge; Vortex vibration performance; Wind barrier permeability; Wind tunnel test;
D O I：
10.16339/j.cnki.hdxbzkb.2021.11.002
中图分类号：
学科分类号：
摘要：
In order to study the influence of air permeability of wind barrier on vortex-induced vibration performance of the main girder, based on a long-span steel box girder suspension bridge with 808 m main span, wind-induced vibration response and pressure time history data of each measuring point on the surface were obtained by wind tunnel vibration measurement and pressure measurement test. The vortex vibration performance of the original section was measured within the range of ± 5 ° angle of attack after the wind barrier was added. The vortex vibration response performance of the main girder, the mean value and root variance of the fluctuating pressure coefficient of each measuring point on the bridge deck, the correlation and contribution coefficient between local aerodynamic force and overall aerodynamic force were compared and analyzed among the original section as well as three different ventilation rates and five conditions of water adding horizontal splitter plates. The results show that multi-interval vertical bending vortex-induced vibration occurs on the original section at + 5 °angle of attack, and the amplitude of vortex-induced vibration is far beyond the allowable value in the code. The vortex-induced resonance of the main girder is affected by the wind barrier with different air permeability, which eliminates the vortex-induced vibration of the original section of the main beam in the low wind speed range, and the maximum amplitude is also reduced to a certain extent. According to the analysis of the measured pressure data, the pressure fluctuation of the middle and rear part of the main beam is weakened, and the contribution coefficients of the local aerodynamic force and the overall aerodynamic force are reduced, which makes the amplitude of the main beam decrease slightly; after the horizontal splitter plate is added at the wind nozzle of the main beam, the correlation between the local aerodynamic force and the total aerodynamic force is completely destroyed, and the pressure fluctuation is weakened, which effectively suppresses the vortex induced vibration of the main beam in this case. © 2021, Editorial Department of Journal of Hunan University. All right reserved.
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页码：12 / 21
页数：9
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