汽车和列车荷载共同作用下公铁两用桥的动力响应

Dynamic Responses of the Road-Rail Bridge under the Vehicle and Train Load

为了研究公铁两用桥汽车荷载、列车荷载和列车汽车荷载共同作用下的不同荷载组合对车桥耦合振动的影响,本文以滨州公铁两用钢桁梁桥为例,采用Ansys软件建立桥梁模型,并推导建立桥梁、汽车和列车的运动方程,通过三个子系统之间的相互作用,对三个子系统进行耦合,并采用Matlab软件编程求解,分析了三种工况下的汽车列车桥梁耦合系统的动力响应。研究结果表明,当汽车和列车同时作用在桥梁结构上时,与仅有汽车或仅有列车作用下的动力响应结果对比并不是简单地叠加关系,且不同位置的动力响应峰值也不一定出现在哪种工况下,所以对于公铁两用桥的结构设计,建议必须考虑多种不同工况,取包络设计。该研究为公铁两用桥的桥梁结构设计提供了理论依据。

In order to study the influence of 3 loads cases,including only considering the vehicle or train loads and considering the vehicle and train load together,on the vehicle-bridge coupled vibration of road-rail bridge,taking the Binzhou road-rail steel truss bridge as an example,bridge model is built by ANSYS,the motion equations of bridge,car and train are deduced and established respectively.Through the interaction among the three subsystems,the three subsystems are coupled.The dynamic responses of the whole system only considering the vehicle or train loads and considering the vehicle and train load together are analyzed by Matlab.The results show that the dynamic response under the vehicle and train loads is not a simple superposition of those under the vehicle or train load separately.And the peak dynamic responses at different positions do not assure to appear under one certain condition.Therefore,different conditions need to be considered when the road-rail bridge is designed.