The Study Of Vehicle-Bridge Coupled Vibration Considering Wheel-Rail Creep In Surface Contact Condition

Nowadays bridges are widely used in high speed railway,which makes bridges a significant part of high speed rail system.It is the Wheel-Rail contact effect when the train passes the bridge that leads to the Vehicle-Bridge coupled vibration and surface rolling contact considering creep effect can simulate the wheel-rail contact process that vehicle passes the bridge more realistically,so it is essential to study Vehicle-Bridge coupled vibration based on surface rolling contact considering creep effect.Frist,ANSYS finite element software is used to simulate the Vehicle-Bridge coupled vibration process based on some traditional methods.Compared the results of smooth condition and irregularity condition,basic characteristics of Vehicle-Bridge coupled vibration are analyzed.Then a 3-D surface rolling contact Vehicle-Bridge coupled vibration model is established in LS-DYNA which computes with explicit integration algorithm.Compared with traditional point contact model in smooth condition,it can found that they have the same results,which can show the rationality and applicability of surface rolling contact method.But in the condition of irregularity condition point contact method has a larger result,which makes point contact method inaccurate in this condition.After these,wheel rail rolling contact creep theory is introduced.A 3-D surface rolling contact Vehicle-Bridge coupled vibration model is established in LS-DYNA which takes creep effect into consideration.It comparatively analyses what effect different creepages,different friction coefficient makes to Vehicle-Bridge coupled vibration in smooth condition,and what effect creep makes to Vehicle-Bridge coupled vibration in irregularity condition.The results show that creep can effect the horizontal force of bridge and make midspan-displacement larger in smooth condition;the creep will be larger along with the increase of friction coefficient,then it makes greater adverse influence to Vehicle-Bridge coupled vibration;creep not only makes a difference to horizontal force of bridge but also effects vertical force of bridge,which makes a greater adverse impact to Vehicle-Bridge coupled vibration.