Analysis Of Vehicle-induced Vibration Response Of Track Beam Under Elastic Support

With the rapid development of urban elevated rail transit,environment vibration effect caused by vehicle-induced vibration is getting worse.As a significant bridge structural components,bridge bearing,playing the role of connecting the superstructure and substructure,has the function of isolating the ways of the vibrations considering from the principle of vibration.In past studies,scholars generally ignored the resilient impact of bridge bearing,considering bridge bearing as the rigid support.However,rubber bearing which is widely used in recent years is,instead of rigid support,flexible support.Especially for bridge damping bearing,its vertical stiffness becomes lower and lower.In order to study the effect of elastic support on coupled vibration of vehicle,in this paper,the research work of vehicle-induced vibration response analysis of track beam under elastic support conditions has been done,mainly including:(1)Based on traditional coupled vibration theory,establishing mobile force loading model,mobile harmonic force loading model and gear shifting wheel-sprung mass loading model separately,vehicle-induced vibration response calculation formula of elastic support beam has been deduced.(2)Respectively,discussed the influence of different parameters,such as stiffness ratio,damping ratio,frequency ratio and mass ratio between vehicle and bridge of axle coupled system to the train-induced vibration response of elastic support beam.(3)The resonance and cancellation phenomenon of elastic support beam under moving load series has been discussed.The results show that: the elastic support conditions is influential on the vehicle-induced vibration response of track beam,rubber bearing is conducive to cut off vehicle-induced vibration spreading to the surrounding.The features of this paper is: establishing the coupled vibration model of the gear shifting wheel-sprung mass loading to analyze the law of the vehicle-induced vibration response of elastic support beam.