来流湍流度对斜拉索风雨激振影响的理论研究
|
摘要
斜拉索风雨激振严重地影响斜拉桥的安全运营,而来流湍流度是影响风雨激振的一个重要因素。采用理论分析方法,研究来流湍流对斜拉索风雨激振响应的影响。引入2种类型的风场,首先,假设来流为简谐脉动风场,然后,采用谐波合成方法,将Kaimal风谱作为目标谱,模拟来流随机脉动风场。采用上述2种来流风场,在已建立的两质量三自由度理论模型的基础上,研究各种湍流度下拉索和水线的风雨激振振动规律。计算结果表明,当湍流度达到15%时,水线不能在拉索表面稳定地存在,风雨激振能得到有效的抑制;水线运动的脉动成分主要受来流风脉动成分的影响,拉索运动对水线运动有一定的影响,但影响较小;随着紊流度的增加,起振风速也增大。
Rain-wind induced vibrations of stay cables seriously affect the safety of cable-stayed bridges,and turbulence intensity in the approaching flow plays an important role in rain-wind induced vibrations.The effects of turbulence intensity of approach flow on rain-wind induced vibrations are investigated.Two types of fluctuating flows are adopted.First,the approaching flow is modeled as a sinusoidal function.Subsequently,fluctuations in wind are simulated as a random process based on the classical Kaimal spectra.The rain-wind induced vibrations under these two approach flows are evaluated on the basis of a theoretical model developed by the authors.The results show that large amplitude cable vibrations will be mitigated if the turbulence intensity reaches 15% due to the vanishing of the rivulet.The rivulet is strongly impacted by the fluctuating component of the approaching flow whereas the motion of the cable has some degree of influences on the motion of the rivulet.The minimum wind velocity of rain-wind induced vibration increases when turbulence intensity increases.
Rain-wind induced vibrations of stay cables seriously affect the safety of cable-stayed bridges,and turbulence intensity in the approaching flow plays an important role in rain-wind induced vibrations.The effects of turbulence intensity of approach flow on rain-wind induced vibrations are investigated.Two types of fluctuating flows are adopted.First,the approaching flow is modeled as a sinusoidal function.Subsequently,fluctuations in wind are simulated as a random process based on the classical Kaimal spectra.The rain-wind induced vibrations under these two approach flows are evaluated on the basis of a theoretical model developed by the authors.The results show that large amplitude cable vibrations will be mitigated if the turbulence intensity reaches 15% due to the vanishing of the rivulet.The rivulet is strongly impacted by the fluctuating component of the approaching flow whereas the motion of the cable has some degree of influences on the motion of the rivulet.The minimum wind velocity of rain-wind induced vibration increases when turbulence intensity increases.
引文
[1]Hikami Y,Shiraishi N.Rain-wind induced vibrations ofcables stayed bridges[J].Journal of Wind Engineeringand Industrial Aerodynamics,1988,29(1/2/3):409-418
[2]陈政清,柳成荫,倪一清,等.洞庭湖大桥拉索风雨振中的风场参数[J].铁道科学与工程学报,2004,1(1):52-57(Chen Zhengqing,Liu Chengyin,Ni Yiqing,et al.Wind parameters in wind-rain induced stay cable vibrationon Dongting Lake Bridge[J].Journal of Railway Scienceand Engineering,2004,1(1):52-57(in Chinese))
[3]Gu Ming,Du Xiaoqin.Experimental investigation of rain-wind-induced vibration of cables in cable-stayed bridgesand its mitigation[J].Journal of Wind Engineering andIndustrial Aerodynamics,2005,93(1):79-95
[4]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 Wenli,Li Hui,Li Fengchen.An ultrasonictransmission thickness measurement system for rivulet onthe stay cable under rain-wind induced vibration[J].Journal of Earthquake Engineering and EngineeringVibration,2009,29(1):139-145(in Chinese))
[5]Yamaguchi H.Analytical study on growth mechanism ofrain vibration of cables[J].Journal of Wind Engineeringand Industrial Aerodynamics,1990,33(1/2):73-80
[6]李寿英,陈政清,顾明.斜拉桥拉索风雨激振的两质量三自由度理论模型[J].土木工程学报,2007,40(10):60-66(Li Shouying,Chen Zhengqing,Gu Ming.Atheoretical model of rain-wind induced vibration of staycables:a coupled two-mass oscillators with three degree-of-freedoms[J].China Civil Engineering Journal,2007,40(10):60-66(in Chinese))
[7]Peil U,Nahrath N,Dreyer O.Modeling of rain-windinduced vibrations[J].Wind and Structures,2003,6(1):41-52
[8]Matsumoto M,Shiraishi N,Shirato H.Rain-wind inducedvibration of cables of cable-stayed bridges[J].Journal ofWind Engineering and Industrial Aerodynamics,1992,43(1/2/3):2011-2022
[9]Gu M,Du X Q,Li S Y.Experimental and theoreticalsimulations on wind-rain-induced vibration of 3-D rigid staycables[J].Journal of Sound and Vibration,2009,320(1/2):184-200
[10]Deodatis G.Simulation of ergodic multivariate stochasticprocesses[J].Journal of Engineering Mechanics,1996,122(8):778-787
[11]Holmes J D.Wind loading of structures[M].London:Spon Press,2001
[2]陈政清,柳成荫,倪一清,等.洞庭湖大桥拉索风雨振中的风场参数[J].铁道科学与工程学报,2004,1(1):52-57(Chen Zhengqing,Liu Chengyin,Ni Yiqing,et al.Wind parameters in wind-rain induced stay cable vibrationon Dongting Lake Bridge[J].Journal of Railway Scienceand Engineering,2004,1(1):52-57(in Chinese))
[3]Gu Ming,Du Xiaoqin.Experimental investigation of rain-wind-induced vibration of cables in cable-stayed bridgesand its mitigation[J].Journal of Wind Engineering andIndustrial Aerodynamics,2005,93(1):79-95
[4]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 Wenli,Li Hui,Li Fengchen.An ultrasonictransmission thickness measurement system for rivulet onthe stay cable under rain-wind induced vibration[J].Journal of Earthquake Engineering and EngineeringVibration,2009,29(1):139-145(in Chinese))
[5]Yamaguchi H.Analytical study on growth mechanism ofrain vibration of cables[J].Journal of Wind Engineeringand Industrial Aerodynamics,1990,33(1/2):73-80
[6]李寿英,陈政清,顾明.斜拉桥拉索风雨激振的两质量三自由度理论模型[J].土木工程学报,2007,40(10):60-66(Li Shouying,Chen Zhengqing,Gu Ming.Atheoretical model of rain-wind induced vibration of staycables:a coupled two-mass oscillators with three degree-of-freedoms[J].China Civil Engineering Journal,2007,40(10):60-66(in Chinese))
[7]Peil U,Nahrath N,Dreyer O.Modeling of rain-windinduced vibrations[J].Wind and Structures,2003,6(1):41-52
[8]Matsumoto M,Shiraishi N,Shirato H.Rain-wind inducedvibration of cables of cable-stayed bridges[J].Journal ofWind Engineering and Industrial Aerodynamics,1992,43(1/2/3):2011-2022
[9]Gu M,Du X Q,Li S Y.Experimental and theoreticalsimulations on wind-rain-induced vibration of 3-D rigid staycables[J].Journal of Sound and Vibration,2009,320(1/2):184-200
[10]Deodatis G.Simulation of ergodic multivariate stochasticprocesses[J].Journal of Engineering Mechanics,1996,122(8):778-787
[11]Holmes J D.Wind loading of structures[M].London:Spon Press,2001
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心