RESEARCH ON THE FACTORS OF 3-D MODEL OF THE RAIN-WIND INDUCED VIBRATION OF CABLE

The rain-wind induced vibration (RWIV) of cables in cable stayed bridges is the typical phenomenon. The most difficult problem of establish the model of the RWIV is the analysis and hypothesis of the rivulet’s stress and characteristics of motion. In this paper, the comparative study of RWIV will be proceeding. Aiming at the problem of the model of the rivulet, a kind of the sine function is accepted, and another kind of the rivulet model is established on the basis of analysis on the stress of the rivulet. Then, solve the equations of cable and the rivulet jointly by numerical method, get the characteristics of motion of the cable and rivulet, then verify the rationality of ignoring the influence of the second model of a cable and discuss the impact to the amplitude of a cable caused by vibration amplitude of rivulet, the larger amplitude of the rivulet, the larger amplitude of the cable, then investigate the factors like the mass of per unit length rivulet and the mean wind speed which is related with the frequency of a rivulet. Finally, the phase relationship between a rivulet and a cable is researched and draw some more rational explanations of the RWIV phenomenon.