斜拉桥拉索-桥面耦合振动分析

Analysis of Couple Vibration of Cable and Deck on the Cable-Stayed Bridges

斜拉桥拉索固有阻尼低、刚度小,容易引起大幅振动.基于拉索振动理论,建立了单根拉索及拉索-桥面耦合振动的方程,分析了拉索振动对桥面的作用以及桥面振动引起的拉索振动.研究表明拉索的大幅振动将对桥面产生很大的作用力,而当满足参数共振条件时桥面微小的振动能引起拉索的大幅振动.图6,参8.

The large amplitude cable vibration often is induced due to low damping and small stiffness of stay cable. Based on vibration theory of cable, the motion equations of the single cable and the coupled cable-deck system were founded. The effort on deck by cable vibration and cable vibration due to anchored motion were studied. Results show that the applied force cause under deck due to the large amplitude vibration of cable and the large amp^tude vibration also happen on cable when the condition of parametric resonance is met, even if vibration amplitude on anohored end is very small. 6figs., 8refs.