风速对水线及斜拉索振动的影响
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摘要
斜拉桥拉索的风雨激振是特定风速及降雨条件下的低频、大幅度振动,为研究风速对斜拉索风雨激振的影响,将两自由度滑移理论模型与Comsol软件相结合,大幅提高了计算效率,通过数值计算得到了不同风速下的水线运动规律、拉索气动力变化规律及其振动响应。结果表明:斜拉索发生风雨激振时,横风向振幅约为顺风向振幅的两倍;只有当风速处于特定风速范围内时,斜拉索才会发生明显的风雨激振现象,此时上水线振荡频率及气动力变化频率均接近拉索自振频率,水线与拉索间的共振是风雨激振的主要原因之一。
Rain-wind induced vibration(RWIV) is a large amplitude and low frequency vibration of cables of cable-stayed bridges under simultanuous wind and rain. In order to investigate the effects of wind velocity on the RWIV, a 2-DOF slip model based on the lubrication theory was built and combined with the Comsol software to enhance the efficiency of numerical calculation. The characteristics of rivulet movements, aerodynamic forces and cable vibrations were investigated by numerically solving the coupled equations of the water film and cable. The results show that the amplitude of cable vibration in across-wind direction is double that in along-wind direction. RWIV only occurs in a special range of wind velocities, while the frequencies of upper rivulet oscillation and aerodynamic forces are both close to the cable natural frequency. The resonance between rivulets and cables is one of the main causes of RWIV.
Rain-wind induced vibration(RWIV) is a large amplitude and low frequency vibration of cables of cable-stayed bridges under simultanuous wind and rain. In order to investigate the effects of wind velocity on the RWIV, a 2-DOF slip model based on the lubrication theory was built and combined with the Comsol software to enhance the efficiency of numerical calculation. The characteristics of rivulet movements, aerodynamic forces and cable vibrations were investigated by numerically solving the coupled equations of the water film and cable. The results show that the amplitude of cable vibration in across-wind direction is double that in along-wind direction. RWIV only occurs in a special range of wind velocities, while the frequencies of upper rivulet oscillation and aerodynamic forces are both close to the cable natural frequency. The resonance between rivulets and cables is one of the main causes of RWIV.
引文
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[11] FAGE A,FALKNER V W.Further experiments on the flow around a circular cylinder [M].London:Aeronautical Research Committee,Reports and Memoranda,1931.
[12] CELIKA I,SHAFFER F D.Long time-averaged solutions of turbulent flow past a circular cylinder [J].Journal of Wind Engineering and Industrial Aerodynamics,1995,56:185-212.
[13] LI H,LI F C,CHEN W L,et al.A numerical and experimental hybrid approach for the investigation of aerodynamic forces on stay cables suffering from rain-wind induced vibration [J].Journal of Fluids and Structures,2010,26:1195-1215.
[14] CHEN W L,TANG S R,LI H,et al.Influence of dynamic properties and position of rivulet on rain-wind-induced [J].Journal of Bridge Engineering,2013,18:1021-1031.
[15] NI Y Q,WANG X Y,CHEN Z Q,et al.Field observations of rain wind induced cable vibration in cable stayed Dongting lake bridge [J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95:303-328.
[2] LEMAITRE C,HEMON P,LAMNGRE E.Thin water film around a cable subject to wind [J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95:1259-1271.
[3] LEMAITRE C,LANGRE E,HéMON P.Rainwater rivulets running on a stay cable subject to wind[J].European Journal of Mechanics B/Fluids,2010,29:251-258.
[4] 许林汕,葛耀君,赵林.高精度风雨模拟环境下拉索风雨激振试验研究新发现[J].土木工程学报,2011,44:86-93.XU Linshan,GE Yaojun,ZHAO Lin.Experimental study of rain and wind induced vibration of stay cables using high precision rain simulation system [J].China Civil Engineering Journal,2011,44:86-93.
[5] TAYLOR I J,ROBERTSON A C.Numerical simulation of the airflow-rivulet interaction associated with the rain-wind induced vibration phenomenon [J].Journal of Wind Engineering and Industrial Aerodynamics,2011,99:931-944.
[6] 毕继红,王剑,逯鹏,等.斜拉索表面水膜形态及斜拉索气动力变化规律[J].天津大学学报(自然科学与工程技术版),2014,47:479-490.BI Jihong,WANG Jian,LU Peng,et al.Variation of water film morphology and aerodynamic force of stay cable [J].Journal of Tianjin University (Science and Technology) ,2014,47:479-490.
[7] BI J H,WANG J,LU P,et al.2D numerical analysis on evolution of water film and cable vibration response subject to wind and rain [J].Journal of Wind Engineering and Industrial Aerodynamics,2013,121:49-59.
[8] LI F C,CHEN W L,LI H.An ultrasonic transmission thickness measurement system for study of water rivulets characteristics of stay cables suffering from wind-rain-induced vibration [J].Sensors and Actuators A:Physical,2010,159:12-23.
[9] LI Y L,JING H Q,XIA Y,et al.Measurement of rivulet movement on inclined cables during rain-wind induced vibration [J].Sensors and Actuators A:Physical,2015,230:17-24.
[10] GU M,DU X Q.Experimental investigation of rain-wind-induced vibration of cables in cable-stayed bridges and its mitigation [J].Journal of Wind Engineering and Industrial Aerodynamics,2005,93:79-95.
[11] FAGE A,FALKNER V W.Further experiments on the flow around a circular cylinder [M].London:Aeronautical Research Committee,Reports and Memoranda,1931.
[12] CELIKA I,SHAFFER F D.Long time-averaged solutions of turbulent flow past a circular cylinder [J].Journal of Wind Engineering and Industrial Aerodynamics,1995,56:185-212.
[13] LI H,LI F C,CHEN W L,et al.A numerical and experimental hybrid approach for the investigation of aerodynamic forces on stay cables suffering from rain-wind induced vibration [J].Journal of Fluids and Structures,2010,26:1195-1215.
[14] CHEN W L,TANG S R,LI H,et al.Influence of dynamic properties and position of rivulet on rain-wind-induced [J].Journal of Bridge Engineering,2013,18:1021-1031.
[15] NI Y Q,WANG X Y,CHEN Z Q,et al.Field observations of rain wind induced cable vibration in cable stayed Dongting lake bridge [J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95:303-328.