大跨度斜拉桥索与桥面耦合振动分析

为探讨大跨度斜拉桥拉索与桥面耦合振动特性,建立了拉索与桥面耦合振动模型,并用数值仿真方法分别对桥面与拉索的频率比、拉索倾角、桥面与拉索质量比对拉索与桥面耦合振动的影响进行了分析.结果表明:拉索不仅在桥面与其频率比为1时会产生共振,而且在频率比为1/2和2时也会产生共振;随着拉索倾角和桥面与拉索质量比的增大,桥面与拉索的频率比为1时,拉索的共振振幅减小,而桥面与拉索的频率比为1/2和2时,共振振幅将明显增大.

Coupled Vibration Analysis of Bridge Deck and Cable of Long-Span Cable-Stayed Bridge

To investigate the characteristics of coupled vibration of bridge deck and cable of a long-span cable-stayed bridge,a model for the coupled vibration of bridge deck and cable was established,and then,the effects of the frequency ratio of bridge deck to cable,the inclined angle of cable and the mass ratio of bridge deck to cable were respectively analyzed by numerical simulation.The research results show that the resonance occurs not only when the frequency ratio is 1,but also when it is 1/2 and 2.With the increases of the inclined angle and the mass ratio,the resonance amplitude will decrease when the frequency ratio is 1,but it will increase obviously when the frequency ratio is 1/2 and 2.