基于洛河大桥的车桥耦合振动响应分析与研究

列车与桥梁相互作用产生放大的耦合振动,过大的振动会影响行车的安全性和舒适性。在洛河大桥分别使典型客车货车以不同的速度过桥,采用美国五级谱模拟轨道的不平顺建模分析,并计算列车过桥时的混凝土强度应力值。分析结果表明,列车过桥受轨道面的平顺性和桥梁刚度影响;随着车速的提高,在轨道平顺性不变的情况下,为控制车桥的相互振动幅值,桥梁设计将由强度控制转化为刚度控制。

Analysis and Research on Vehicle-Bridge Coupling Vibration Response Based on Luohe Bridge

The interaction between the train and the bridge produces an enlarged coupling vibration,and the excessive vibration affects driving safety and comfort.In this paper,the typical passenger and freight trains were used to cross the Luohe Bridge at different speeds,the modeling analysis of irregularity of the United States five levels spectral simulation track was carried out,and concrete strength stress value at the train running across the bridge was calculated.The results showed that the train crossing bridge was affected by the track smoothness and the bridge stiffness;with the increase of vehicle speed,in the case of changeless track smoothness,in order to control the vibration amplitude of the bridge,the design of the bridge would be transformed from the strength control to the stiffness control.