Cable-Beam Vibration Characteristics of Cable-Stayed Bridge under External Excitations

To understand the effect of external excitations on the cable-beam vibration of large-span cable-stayed bridge, firstly, the theoretical equation for the large-amplitude cable vibration was built, and based on nonlinear vibration theory, the dynamic cable element was developed using finite element method(FEM). Secondly, a large cable-stayed bridge FEM modal was built, and the cables of the bridge were simulated by cable dynamic element. Finally, a typical cable-stayed bridge was used as an example to investigate the cable-beam vibration characteristics under different external excitations. The results indicate that it is more reasonable to study the cable-beam vibration on global bridge scale. In cable-beam vibration, there is an energy transfer process. Under external excitations, 1:1 main resonance more easily occurs than 2:1 parametric resonance. The shorter cables close to the towers in cable-stayed bridge are difficult to experience large-amplitude vibration. parametric resonance, main resonance of cable occur more easily. The shorter cables which near by the towers in cable-stayed bridge are difficult to occur large amplitude vibration.