悬索桥吊索尾流致振的气弹模型测振试验
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摘要
为研究大跨度悬索桥吊索发生大幅风致振动机理,设计并制作了光滑双吊索试验模型,进行了尾流索股弹性悬挂测振风洞试验。试验工况包括顺风向X=2.5-11、横风向Y=0-4;测量了尾流索股在不同空间位置的运动响应规律,研究了结构阻尼比、来流风速等对尾流索股风致振动的影响规律。结果表明:在X≤5.25,Y≤1.5的空间范围内,尾流索股会发生大幅尾流致振,其振动形式包括两种类型:单自由度直线运动和双自由度椭圆运动,其稳定运动频率分别稍大于和小于结构固有频率。风速大小对尾流索股的运动规律有明显影响;阻尼比增大可增加起振风速,但对振幅大小影响不大。
In order to study the mechanism of wind-induced large amplitude vibration of long-span suspension bridge hangers,a smooth twin-hanger test model was designed and the wind tunnel test of the elastically suspended wake cable was carried out.The test conditions include along-wind direction X=2.5-11,across-wind direction Y=0-4.The motion responses of the wake cable in different spatial positions were measured.The influence of the structural damping ratio and incoming wind velocity on the wind-induced vibration of the wake cable was studied.The results show that there will be large wake-induced vibrations in the wake of X≤5.25 and Y≤1.5,which include two types:The single degree of freedom linear motion and the two degree of freedom elliptical motion.The stable frequency of motion is slightly larger or smaller than the natural frequency of the structure.The wind velocity has a significant influence on the feature of the movement of the wake cable.Increasing the structure damping ratio shows little effect on the vibration mitigation,while exhibits certain effect on raising the starting wind speed.
In order to study the mechanism of wind-induced large amplitude vibration of long-span suspension bridge hangers,a smooth twin-hanger test model was designed and the wind tunnel test of the elastically suspended wake cable was carried out.The test conditions include along-wind direction X=2.5-11,across-wind direction Y=0-4.The motion responses of the wake cable in different spatial positions were measured.The influence of the structural damping ratio and incoming wind velocity on the wind-induced vibration of the wake cable was studied.The results show that there will be large wake-induced vibrations in the wake of X≤5.25 and Y≤1.5,which include two types:The single degree of freedom linear motion and the two degree of freedom elliptical motion.The stable frequency of motion is slightly larger or smaller than the natural frequency of the structure.The wind velocity has a significant influence on the feature of the movement of the wake cable.Increasing the structure damping ratio shows little effect on the vibration mitigation,while exhibits certain effect on raising the starting wind speed.
引文
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[2]Caetano E D Y.Cable Vibrations in Cable-Stayed Bridges[M].International Association for Bridge and Structural Engineering(IABYE),2007.
[3]陈政清.桥梁风工程[M].北京:人民交通出版社,2005:56-59.Chen Zhenqing.Wind Engineering of Bridge[M].Beijing:China Communications Press,2005:56-59.
[4]葛耀君.大跨度悬索桥抗风[M].北京:人民交通出版社,2011:26-28.Ge Yaojun.Wind Resistance of Long Span Suspension Bridge[M].Beijing:China Communications Press,2011:26-28.
[5]Tokoro Y,Komatsu H,Nakasu M,et al.A study on wake-galloping employing full aeroelastic twin cable wake-induced flutter[J].Journal of Wind Engineering&Industrial Aerodynamics,2000,88:247-261.
[6]Fujino Y,Ishihara T,Kubo Y,et al.Experimental study of wake galloping using full-scale parallel cable models for Higashi Kanjo Bridge[C].Proceedings of the 9th International symposium on Cable Dynamics,Shanghai,2011:191-198.
[7]Li Y L,Xu M X,Chen X Z,et al.wind-tunnel study of wake galloping of parallel cables on cable-stayed bridges and its suppression[J].Wind and Structures,2013,16(3):249-261.
[8]杜晓庆,蒋本建,代钦,等.大跨度缆索承重桥并列索尾流激振研究[J].振动工程学报,2016,29(05):842-850.Du Xiaoqing,Jiang Benjian,Dai Qin,et al.A study on wake excitation of long-span cable-stayed bridges parallel cable[J].Journal of Vibration Engineering,2016,29(5):842-850.
[9]Kitagawa T,Ohta H.Numerical investigation on flow around circular cylinders in tandem arrangement at a subcritical Reynolds number[J].Journal of Fluids and Structure,2007,28:232-246.
[10]黄伟峰,李勇,刘秋生,等.桥梁吊杆索尾流驰振问题的数值研究[J].清华大学学报(自然科学版),2008,48(11):1391-1394.Huang Weifeng,Li Yong,Liu Qiusheng,et al.Numerical investigation of wake galloping of suspension bridge cables[J].Journal of Tsinghua University(science and Technology),2008,48(11):1391-1394.
[11]SIMPSON A.Stability of subconductors of smooth circular cross-section[J].Proceedings of the Institution of Electrical Engineers,1970,117(4):714-750.
[12]SIMPSON A.On the flutter of a smooth circular cylinder in a wake[J].The Aeronautical Quarterly,1971,22(2):25-41.
[13]SIMPSON A.Wake induced flutter of circular cylinders:Mechanical aspects[J].The Aeronautical Quarterly,1971,22(2):101-118.
[14]肖春云,李寿英,陈政清.悬索桥双吊索尾流弛振的失稳区间研究[J].中国公路学报,2016,29(09):53-58+67.Xiao Chunyun,Li Shouying,Chen Zhengqing.Investigation on the instable region of wake galloping for twin hangers of suspension bridge[J].China Journal of Highway and Transport,2016,29(09):53-58+67.
[15]Tomomi Yagi,Masashi Arima,Shinya Araki,et al.Investigation on wake-induced instabilities of parallel circular cylinders based on unsteady aerodynamic forces[C].14th International Conference on Wind Engineering,Porto Alegre,Brazil,2015.
[16]Simiu E,Scanlan R H.Wind Effects on Structures an Introduction to Wind Engineering[M].New York:Wiley,1978.
[17]肖春云.大跨度柔性桥梁双索股尾流驰振机理研究[D].长沙:湖南大学,2016.Xiao Chunyun.The research on mechanism of double strands wake galloping of the long-span flexible bridge[D].Changsha:Hunan University,2016.