Research On The Dynamic Response Of Highway-railway Bridge And The Comfortableness Of Driving Under Car And Vehicle

The vibration of the vehicle,bridge structure and train will be influenced each other.In other words,there is always the mutual coupling between subsystems of car-bridge-train coupling system.In addition,the coupling system is effected by these factors including increase of speed,load and the number of car or train.It is necessary to study the effect of different factors on the coupling system,which is helpful for reinforcement and security assessment of existed bridge structure and designing of new bridge.The solution on vehicle-bridge coupling vibration is finished by MATLAB,this system is affected by some factors such as the initial conditions,speed,load,track irregularity and the damping,which is studied respectively in this paper firstly.this method is easier for a simple bridge modeling.Basic principle is clear for highway-railway bridge with more degrees of freedom.However,it is difficult to come true by this way.The basic principle is analogy in soft called ANSYS.The model of car,train and bridge is established by ANSYS,the coupling between subsystems is implemented by the constraint equation.The car or the train or the car and train exist on bridge at the same time,which will be studied.Thus car-bridge coupling vibration model,vehicle-bridge coupling vibration model and car-bridge-vehicle coupling vibration model are built respectively considering the influence of some factors such as speed and track irregularity and so on.The following results and conclusions is obtained by the study.First,the factors that track irregularity,speed,vehicle load will cause great influence to the driving comfort,the influence of numbers of train is not obvious,the main reason is that interaction effect between different train is ignored in this paper.Second,the mutual influence between cars and trains are different under different factors,thus,it is necessary to built the model of car-bridge-train coupling system.Third,the influence of structure dynamic response when the car and train are running at the same time is not simply superposition of the influence when the car or the train is running.Thus,the acquisition of envelope value of the three conditions is very necessary.