EFFECTS OF EXCITATION AT CABLE ENDS ON RAIN-WIND-INDUCED VIBRATION OF STAYED CABLES

The vibration of actual cables may be the combination of a wind-rain-induced vibration (WRIV) and a parametric vibration. The excitation at cable ends can change the characteristics of WRIV of stayed cables. Considered the effects of an excitation at cable ends, an integrated analytical model including a WRIV and a parametric vibration is developed. In this model, the excitations are transformed into an elastic force and an inertia force which are acted on cable firstly. Then the characteristics of the parametric vibration model and WRIV model are analyzed. And the amplitude, rivulet of motion and the time arrived largest amplitude are investigated to demonstrate the effects of the excitation at cable ends. It shows that the excitation within a range of frequencies at cable ends change the amplitude of WRIV and the time-changing characteristics of rivulet motion, and promote the occurrence of a WRIV.