三维绕流状态下斜拉索阻力系数的风洞试验研究
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摘要
为了考察三维绕流对斜拉索阻力系数的影响,设计了节段支撑模型和斜拉索阻力系数测试系统.对不同直径、不同姿态角的斜拉索,研究了表面形式、水平倾角、风向偏角、紊流度等因素对阻力系数的影响.结果表明:当风向角约为0°时,阻力系数随着水平倾角的增大而增大,当风向角为90°时,水平倾角的变化对阻力系数影响不大;在较高风速下,斜拉索表面压花或附着螺旋肋条使阻力系数增加了1~2倍,且肋条越高、压花表面覆盖率越大,阻力系数越大;紊流度对光面索阻力系数影响显著.
Models of stay cable sections and a corresponding drag coefficient testing system were designed to investigate the effects of cable surface pattern,inclination and yaw angles,and wind turbulence intensity on drag coefficient of the stay cables under 3D wind flows.Wind tunnel test indicates that the drag coefficient increases with an increase in the inclination angle when the yaw angle is about 0°,but it has a little change when the yaw angle is about 90°.The drag coefficient of dimpled cables or cable with helical strakes increases about twice compared with that of smooth cables,and the greater the ratio of dimpled area to the whole surface area and the higher the helical strakes,the larger the drag coefficient.The turbulence intensity has significant effect on the drag coefficient for a smooth cable.
Models of stay cable sections and a corresponding drag coefficient testing system were designed to investigate the effects of cable surface pattern,inclination and yaw angles,and wind turbulence intensity on drag coefficient of the stay cables under 3D wind flows.Wind tunnel test indicates that the drag coefficient increases with an increase in the inclination angle when the yaw angle is about 0°,but it has a little change when the yaw angle is about 90°.The drag coefficient of dimpled cables or cable with helical strakes increases about twice compared with that of smooth cables,and the greater the ratio of dimpled area to the whole surface area and the higher the helical strakes,the larger the drag coefficient.The turbulence intensity has significant effect on the drag coefficient for a smooth cable.
引文
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[11]李永乐,卢伟,陶齐宇,等.斜拉桥拉索风雨致振动特性风洞试验研究[J].试验流体力学,2007,21(4):36-44.LI Yongle,LU Wei,TAO Qiyu,et al.Study on rain-wind induced vibration of cables in cable-stayedbridges by wind tunnel test[J].Journal ofExperiments in Fluid Mechanics,2007,21(4):36-44.
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[13]COSENTINO N.Rain wind induced vibration ofinclined stay cables.part I:experimental investigationand physical explanation[J].Wind and Structures,2003,6(6):471-484.
[14]李文勃,林志兴,杨立波.超长斜拉索风阻系数及风雨激振的试验研究[J].振动、测试与诊断,2005,25(2):85-90.LI Wenbo,LINZhixing,YANG Libo.Investigation ondrag coefficients and rain-wind induced vibration ofextremely long stay cables in wind tunnel[J].Journalof Vibration,Measurement&Diagnosis,2005,25(2):85-90.
[15]王卫华,李明水,陈忻.斜拉索的阻力系数研究[J].空气动力学学报,2005,23(3):390-393.WANG Weihua,LI Mingshui,CHEN Xin.Investigation on drag coefficients of stay cables[J].ACTA Aerodynamica Sinica,2005,23(3):389-393.
[16]YOZO Fujino.Vibration,control and monitoring oflong land bridges-recent research,developments andpractice in Japan[J].Journal of Constructional SteelResearch,2002,58(1):71-97.
[2]雷宇,赵雷,黎曦.大跨度组合梁斜拉桥极限承载力影响因素[J].西南交通大学学报,2009,44(6):812-816.LEI Yu,ZHAO Lei,LI Xi.Influencing factors ofultimate loading-bearing capacity of long-span compositegirder cable-stayed bridge[J].Journal of SouthwestJiaotong University,2009,44(6):812-816.
[3]王波,张海龙,徐丰.考虑拉索局部振动的斜拉桥地震时程响应分析[J].西南交通大学学报,2008,43(4):442-446.WANG Bo,ZHANG Hailong,XU Feng.Seismic time-history response analysis of cable-stayed bridge withlocal cable vibration[J].Journal of Southwest JiaotongUniversity,2008,43(4):442-446.
[4]中交公路规划设计院.JTG/TD60-01-2004公路桥梁抗风设计规范[S].北京:人民交通出版社,2004.
[5]MATSUMOTO M.Wind-induced vibration of cables ofcable-stayed bridges[J].Journal of Wind Engineeringand Industrial Aerodynamics,1998,74-76(1):1015-1027.
[6]GU Ming,DU Xiaoqin.Experimental investigation ofrain-wind-induced vibration of cables in cable-stayedbridges and its mitigation[J].Journal of WindEngineering and Industrial Aerodynamics,2005,93(1):79-95.
[7]LI Mingshui.Stonecutters bridge design andconstruction assignment,design phase wind tunneltesting-drag loading and rain wind vibration of staycables,method statement for drag coefficient tests,CARDC-technical report[R].Mianyang:CARDC,2003.
[8]PEI U.Rain-wind induced vibrations of cables inlaminar and turbulent flow[J].Wind Engineering andStructures,2007,10(1):83-97.
[9]VIRLOGEUM.Recent evolution of cable-stayed bridges[J].Engineering Structures,1999,21(8):737-755.
[10]何向东,廖海黎,李明水,等.斜拉索风雨振动试验研究[C]∥第十一届全国结构风工程学术会议论文集.三亚:中国土木工程学会桥梁与结构工程分会,2004:210-214.
[11]李永乐,卢伟,陶齐宇,等.斜拉桥拉索风雨致振动特性风洞试验研究[J].试验流体力学,2007,21(4):36-44.LI Yongle,LU Wei,TAO Qiyu,et al.Study on rain-wind induced vibration of cables in cable-stayedbridges by wind tunnel test[J].Journal ofExperiments in Fluid Mechanics,2007,21(4):36-44.
[12]OLIVIER F.Rain-wind induced vibration[J].Journalof Wind Engineering and Industrial Aerodynamics,1995,57:353-362.
[13]COSENTINO N.Rain wind induced vibration ofinclined stay cables.part I:experimental investigationand physical explanation[J].Wind and Structures,2003,6(6):471-484.
[14]李文勃,林志兴,杨立波.超长斜拉索风阻系数及风雨激振的试验研究[J].振动、测试与诊断,2005,25(2):85-90.LI Wenbo,LINZhixing,YANG Libo.Investigation ondrag coefficients and rain-wind induced vibration ofextremely long stay cables in wind tunnel[J].Journalof Vibration,Measurement&Diagnosis,2005,25(2):85-90.
[15]王卫华,李明水,陈忻.斜拉索的阻力系数研究[J].空气动力学学报,2005,23(3):390-393.WANG Weihua,LI Mingshui,CHEN Xin.Investigation on drag coefficients of stay cables[J].ACTA Aerodynamica Sinica,2005,23(3):389-393.
[16]YOZO Fujino.Vibration,control and monitoring oflong land bridges-recent research,developments andpractice in Japan[J].Journal of Constructional SteelResearch,2002,58(1):71-97.
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