Effects of wind velocity on the rivulet and rain-wind induced vibration of stay cables

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 184-191.

WANG Jian1,BI Jihong2,HE Xuhui3,GUAN Jian2,QIAO Haoyue2

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Abstract

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.

Key words

rain-wind induced vibration / stay cable / lubrication theory / wind velocity / rivulet

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WANG Jian1,BI Jihong2,HE Xuhui3,GUAN Jian2,QIAO Haoyue2. Effects of wind velocity on the rivulet and rain-wind induced vibration of stay cables[J]. Journal of Vibration and Shock, 2019, 38(2): 184-191

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