大宽高比桥梁断面风致涡激振动机理研究
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- 英文论文题名：Research on Oscillation Mechanism of Vortex-Induced Vibration for Large Aspect Ratio Bridge Decks
- 论文作者：周帅 ; 陈克坚 ; 曾永平
- 英文论文作者：Zhou Shuai ; Chen Kejian ; Zeng Yongping ; China Railway Eryuan Engineering Group Co.Ltd
- 年：2016
- 作者机构：中铁二院工程集团有限责任公司;
- 论文关键词：桥梁 ; 涡振 ; 锁定区间 ; 数值模拟 ; 尾流漩涡
- 英文论文关键词：bridges ; vortex-induced vibration ; lock-in ; numerical simulation ; wake vortices
- 会议召开时间：2016-10-14
- 会议录名称：“川藏铁路建设的挑战与对策”2016学术交流会论文集
- 语种：中文
- 分类号：U441.3
- 学会代码：ZGTD
- 会议名称：“川藏铁路建设的挑战与对策”2016学术交流会
- 会议地点：中国四川成都
- 主办单位：中国铁道学会、中国铁道学会工程分会、中国中铁股份有限公司、中铁二院工程集团有限责任公司
- 学会名称：中国铁道学会
- 页数：10
- 文件大小：929k
- 原文格式：O
- 会议级别：全国
摘要
对于某类大宽高比桥梁断面或者钝体形式断面,在基于同一组试验参数的节段模型风洞试验中,能够实测到相同振型两个分离的涡振锁定区间现象,并且两个区间内振动频率一致,这与一个断面对应一个Strouhal数的理论不相符合。为了进一步研究这类非常规振动形式的气动机理,以一组宽高比为6的矩形断面为研究对象,基于风洞试验中实测的两个独立的涡振锁定区间响应数据,采用流体动力学软件Fluent开展了相应的数值模拟研究。数值计算获取了与风洞试验一致的两个独立分离的涡振锁定区间风振曲线,并且在区间跨度以及幅值关系上均吻合良好,然后通过Fluent提取了前后两个涡振锁定区间内的气动力和尾流漩涡进行了对比研究。研究结果表明,第一个锁定区间内的尾流漩涡呈现出经典的卡门涡街形态,第二个区间内的尾流涡模态则主要表现为非典型的"鱼尾摆动"形态,两个涡振区间的尾流形态完全不同;在两个独立的锁定区间内,气动升力与位移响应之间始终存在着相位差,并且均随着锁定区间的发展而持续增大,第一个锁定区间相位差的跳跃程度明显大于第二个锁定区间。
For some large aspect ratio bridge decks or similarbluff bodies,two separate vortex-induced vibration lock-in of the same DOF can be observed in the same section model wind tunnel tests,and the dominant oscillating frequencies of the two lock-in are the same,which is against the traditional Strouhal law.In order to get a further understanding on aerodynamic mechanisms of these oscillations,a rectangular cylinder whose aspect ratio is 6 is taken as research object,and based on its2 D section model wind tunnel tests parametersand results,the Fluent based numerical simulations are performed.The simulation results have a good agreement with experimental results not only on lock-in range but on amplitude response,then after,more details about aerodynamic forces and wake vortices are obtained by the post processing of Fluent.The study show that,the wake vortices of the first VIV lock-in is the typical Karmen vortex mode,while the second one is rather different from the first one,the wake vortices are observed to be "fish tail waving" mode;in the two separate lock-in,there is always a phase difference between aerodynamic lift and vertical displacement response,and the phase difference is continuously increasing until the end of lock-in,moreover,the jump of phase difference of the first lock-in is more serious than the second one.
For some large aspect ratio bridge decks or similarbluff bodies,two separate vortex-induced vibration lock-in of the same DOF can be observed in the same section model wind tunnel tests,and the dominant oscillating frequencies of the two lock-in are the same,which is against the traditional Strouhal law.In order to get a further understanding on aerodynamic mechanisms of these oscillations,a rectangular cylinder whose aspect ratio is 6 is taken as research object,and based on its2 D section model wind tunnel tests parametersand results,the Fluent based numerical simulations are performed.The simulation results have a good agreement with experimental results not only on lock-in range but on amplitude response,then after,more details about aerodynamic forces and wake vortices are obtained by the post processing of Fluent.The study show that,the wake vortices of the first VIV lock-in is the typical Karmen vortex mode,while the second one is rather different from the first one,the wake vortices are observed to be "fish tail waving" mode;in the two separate lock-in,there is always a phase difference between aerodynamic lift and vertical displacement response,and the phase difference is continuously increasing until the end of lock-in,moreover,the jump of phase difference of the first lock-in is more serious than the second one.
引文
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[5]Garrett J L.Flow-induced vibration of elastically supported rectangular cylinders:[D].Iowa:Iowa State University,2003
[6]Matsumoto M.Vortex shedding of bluff bodies:a review[J].Journal of Fluids and Structures,1999,13(1):791-811
[7]Chen Zhengqing,Chen Wen,Hua Xugang.Higher Modes'Vertical Vortex-induced Vibrations of Suspension Bridges—Part 2:Aeroelastic Model Study[C]//University of Nottingham.EACWE VII,Cambridge:University of Nottingham,2013.
[8]Eurocode:Actions on structures[S].Brussels:CEN national Members,2004.
[9]Sarpkaya T.A critical review of the intrinsic nature of vortex-induced vibrations[J].Journal of Fluids and Structures,2004,19(1):389-447.
[10]Matsumoto M.Vortex shedding of bluff bodies:a review.Journal of Fluids and Structures,1999,13:791-811.
[2]张志田,陈政清.桥梁节段与实桥涡激共振幅值的换算关系[J].土木工程学报,201I,44(7):77-82.Zhang Zhitian,Chen Zhengqing.Vibration amplitude relationship between practical bridge and section model[J].Journal of Civil Engineering,2011,44(7):77-82.
[3]陈政清.桥梁风工程[M].北京:人民交通出版社,2005.Chen Zhengqing.Wind Engineering on Bridges[M].Bejing:Publication of people's transport,2005.
[4]陈艾荣.苏通桥主桥高雷诺数下涡激振动及三分力特性试验研究总报告[R].WT-200418,上海:同济大学土木工程防灾国家重点实验室,2004.Chen Airong.Experimental report on three component aerodynamic force coefficients of Sutong bridge deck at high Reynolds number[R].WT-200418,Shanghai:National key laboratory of disaster preventing on civil engineering structures of Tongji University,2005.
[5]Garrett J L.Flow-induced vibration of elastically supported rectangular cylinders:[D].Iowa:Iowa State University,2003
[6]Matsumoto M.Vortex shedding of bluff bodies:a review[J].Journal of Fluids and Structures,1999,13(1):791-811
[7]Chen Zhengqing,Chen Wen,Hua Xugang.Higher Modes'Vertical Vortex-induced Vibrations of Suspension Bridges—Part 2:Aeroelastic Model Study[C]//University of Nottingham.EACWE VII,Cambridge:University of Nottingham,2013.
[8]Eurocode:Actions on structures[S].Brussels:CEN national Members,2004.
[9]Sarpkaya T.A critical review of the intrinsic nature of vortex-induced vibrations[J].Journal of Fluids and Structures,2004,19(1):389-447.
[10]Matsumoto M.Vortex shedding of bluff bodies:a review.Journal of Fluids and Structures,1999,13:791-811.