高架轨道-桥梁耦合系统振动特性分析

Analysis on Vibration Characteristics of Elevated Track and Bridge Coupling System

分别建立了钢弹簧浮置板轨道-桥梁耦合系统、弹性扣件轨道-桥梁耦合系统的有限元模型,分析比较了该2种轨道-桥梁耦合系统在不同桥梁支座下的振动特性。结果表明,桥梁弹性支座降低了系统的刚度,从而使系统的固有频率低于刚性支座下的固有频率;钢弹簧浮置板轨道-桥梁耦合系统的固有频率随着轨道板下弹簧刚度的增大而增大;扣件刚度的改变对于弹性扣件轨道-桥梁耦合系统的振动特性几乎没有影响;钢弹簧浮置板轨道-桥梁耦合系统以及弹性扣件轨道-桥梁耦合系统的固有频率均低于桥梁自身的固有频率。

The vibration characteristics of this 2 track-bridge coupling systems tinder different bridge bearings are compared and analyzed. The results show that the elastic support of bridge reduces the system stiffiness, so the natural frequency of the system is lower than the natural frequency of the rigid support： the natural frequency of the steel spring floating slab track - bridge coupling system increases with the spring stiffness under track slab. The change of fastener stiffness almost has no impact on the vibration characteristics for elastic fastener track-bridge coupling system; The natural frequency of steel spring floating slab track-bridge coupling system and the elastic fastener track-bridge coupling system are both lower than the natural frequency of the bridge itself.