斜拉索风雨激振三维模型试验研究
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摘要
为研究风雨共同作用下拉索的气动力特性,以之江大桥为背景,通过对斜拉索的三维刚性节段模型做测力、测压风洞试验,得到4种表面形态下的拉索在不同风向角时的平均和脉动风压系数,结果表明:水线位置强烈影响拉索表面的风压系数分布,靠近水线附近气流的分离点会产生明显的改变,仅当上水线处于某些特定位置时,气动力系数变化明显,拉索才可能发生振动;用测压试验的风压系数积分得到的阻力系数要比测力试验的小10%左右,这是测压试验无法获得气动力中的摩擦分量所导致的。
To study the aerodynamic characteristics of stray cable under wind and rain,with Zhijiang bridge as the background,force and pressure experiments on the three-dimensional model of stay cable in wind tunnel were conducted,and mean and fluctuating wind-pressure coefficients with 3 kinds of surface morphology under different wind direction angles were obtained.The results show that the rivulet position would influence the pressure coefficient distribution of cable surface strongly,and the separation point of flow nearby the rivulet will be changed obviously.When the rivulet is in some special positions,the aerodynamic coefficients will change obviously and the cable will vibrate;the drag coefficient obtained from integration of wind pressure coefficient by pressure experiment is 10% less than that from force experiment,as the friction number can't be got from the pressure experiment.Necessary numerical reference and theory basis are provided to establish more precise theoretical model and study the efficiency of rain-wind-induced vibration damping measures.The results can provide guidance for the wind-resistant design and safe production of long-span cable-stayed bridges.
To study the aerodynamic characteristics of stray cable under wind and rain,with Zhijiang bridge as the background,force and pressure experiments on the three-dimensional model of stay cable in wind tunnel were conducted,and mean and fluctuating wind-pressure coefficients with 3 kinds of surface morphology under different wind direction angles were obtained.The results show that the rivulet position would influence the pressure coefficient distribution of cable surface strongly,and the separation point of flow nearby the rivulet will be changed obviously.When the rivulet is in some special positions,the aerodynamic coefficients will change obviously and the cable will vibrate;the drag coefficient obtained from integration of wind pressure coefficient by pressure experiment is 10% less than that from force experiment,as the friction number can't be got from the pressure experiment.Necessary numerical reference and theory basis are provided to establish more precise theoretical model and study the efficiency of rain-wind-induced vibration damping measures.The results can provide guidance for the wind-resistant design and safe production of long-span cable-stayed bridges.
引文
[1]Hikami Y,Shiraishi N.Rain-wind induced vibrations of cables in cable stayed bridges[J].Journal of Wind Engineeringand Industrial Aerodynamics,1988,29(6):409-418.
[2]Yamaguchi H,Fujino Y.Stayed cable dynamics and its vibration control[J].Bridge Aerodynamic,1998,11(3):235-253.
[3]Matsumoto M.Vortex-induced cable vibration of cable-stayed[J].Journal of Wind Engineering and Industrial Aerodynam-ics,2001,89(1):633-647.
[4]许铎.桥梁工程施工中事故环境风险评估[J].中国安全科学学报,2003,13(8):46-49.XU Duo.The construction of bridge engineering accidents of environmental risk assessment[J].China Safety Science Jour-nal,2003,13(8):46-49.
[5]陈政清.斜拉索风雨振动现场观测与振动控制[J].建筑科学与工程学报,2005,22(4):5-10.CHEN Zheng-qing.On-site observation of wind-rain induced vibration of stay cables and its control[J].Journal of Archi-tecture and Civil Engineering,2005,22(4):5-10.
[6]杜晓庆.斜拉桥拉索风雨激振研究[D].上海:同济大学,2003.DU Xiao-qing.Investigation of Rain-wind-induced Vibration of Cables in Cable-stayed Bridges[D].Shanghai:TongjiUniversity,2003.
[7]李文勃.斜拉桥拉索三维风雨激振及静风荷载研究[D].上海:同济大学,2007.LI Wen-bo.Investigation of Rain-wind-induced Vibration and Static Wind Loads of Cables in Cable-stayed Bridges[D].Shanghai:Tongji University,2007.
[8]顾明,杜晓庆.不同风向角下斜拉桥拉索模型测压试验研究[J].振动与冲击,2005,24(6):5-8.GU Ming,DU Xiao-qing.Investigation of pressure experiment on cables in cable-stayed bridges with different wind directionangles[J].Vibration and Shock,2005,24(6):5-8.
[9]陈文礼,李惠,李凤臣.斜拉索风雨激振水线的超声波测试研究[J].地震工程与工程振动,2009,29(1):139-145.CHEN Wen-li,LI Hui,LI Feng-chen.Investigation of ultrasonic test on rivulet in Rain-wind-induced Vibration[J].Earth-quake Engineering and Engineering Vibration,2009,29(1):139-145.
[10]顾明,杜晓庆.带人工雨线的斜拉桥拉索模型测压试验研究[J].空气动力学学报,2005,23(4):419-424.GU Ming,DU Xiao-qing.Investigation of pressure experiment on cables in cable-stayed bridges with rivulet[J].Aerody-namics Journal,2005,23(4):419-424.
[2]Yamaguchi H,Fujino Y.Stayed cable dynamics and its vibration control[J].Bridge Aerodynamic,1998,11(3):235-253.
[3]Matsumoto M.Vortex-induced cable vibration of cable-stayed[J].Journal of Wind Engineering and Industrial Aerodynam-ics,2001,89(1):633-647.
[4]许铎.桥梁工程施工中事故环境风险评估[J].中国安全科学学报,2003,13(8):46-49.XU Duo.The construction of bridge engineering accidents of environmental risk assessment[J].China Safety Science Jour-nal,2003,13(8):46-49.
[5]陈政清.斜拉索风雨振动现场观测与振动控制[J].建筑科学与工程学报,2005,22(4):5-10.CHEN Zheng-qing.On-site observation of wind-rain induced vibration of stay cables and its control[J].Journal of Archi-tecture and Civil Engineering,2005,22(4):5-10.
[6]杜晓庆.斜拉桥拉索风雨激振研究[D].上海:同济大学,2003.DU Xiao-qing.Investigation of Rain-wind-induced Vibration of Cables in Cable-stayed Bridges[D].Shanghai:TongjiUniversity,2003.
[7]李文勃.斜拉桥拉索三维风雨激振及静风荷载研究[D].上海:同济大学,2007.LI Wen-bo.Investigation of Rain-wind-induced Vibration and Static Wind Loads of Cables in Cable-stayed Bridges[D].Shanghai:Tongji University,2007.
[8]顾明,杜晓庆.不同风向角下斜拉桥拉索模型测压试验研究[J].振动与冲击,2005,24(6):5-8.GU Ming,DU Xiao-qing.Investigation of pressure experiment on cables in cable-stayed bridges with different wind directionangles[J].Vibration and Shock,2005,24(6):5-8.
[9]陈文礼,李惠,李凤臣.斜拉索风雨激振水线的超声波测试研究[J].地震工程与工程振动,2009,29(1):139-145.CHEN Wen-li,LI Hui,LI Feng-chen.Investigation of ultrasonic test on rivulet in Rain-wind-induced Vibration[J].Earth-quake Engineering and Engineering Vibration,2009,29(1):139-145.
[10]顾明,杜晓庆.带人工雨线的斜拉桥拉索模型测压试验研究[J].空气动力学学报,2005,23(4):419-424.GU Ming,DU Xiao-qing.Investigation of pressure experiment on cables in cable-stayed bridges with rivulet[J].Aerody-namics Journal,2005,23(4):419-424.
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