考虑主缆振动的悬索桥三维颤振分析

Three-dimensional Flutter Analysis of Suspension Bridges Considering the Effects of Cable Vibration

传统悬索桥颤振分析中通常忽略作用在主缆上的自激力。在系统颤振运动方程中同时纳入作用在主梁与主缆上自激力的贡献 ,研究主缆振动对悬索桥颤振稳定性的影响。以某悬索桥设计方案为工程背景 ,对该桥主梁架设阶段和成桥状态分别进行了三维颤振分析。与传统仅考虑作用在主梁上自激力的颤振分析结果相比 ,考虑主缆振动后计算所得系统颤振临界风速将会提高 ,且对主梁早期架设阶段影响较大 ,对后期架设阶段以及成桥状态影响较小。

The effects of the cable vibration on flutter stability of long span suspension bridges were neglected in traditional analysis In this paper, the self exited forces that act on both the deck and the main cables of the bridge are brought into the system's motion equation, and a three dimensional flutter analysis method is established Then, on the engineering background of a suspension bridge tender project, the three dimensional flutter analysis during the deck erection and at the completion of the bridge is performed Contrast to the results that only consider the self exited forces acting on the deck, the critical wind speed is improved, and the effect is more important at the early stages of the erection, but it is little at the later stages and the completion condition