Earthquake Response Analysis Of Ballastless Track On Bridge And Influence Of Track Deformation On Running Safety Of High-speed Train

With the rapid development of high-speed railways,my country's high-speed railway network is distributed throughout the country,and at the same time,my country is also an earthquake-prone area.The seismic belts are widely spread,which also causes high-speed railways and seismic belts to interlace.The railway system is an important transportation system for post-earthquake recovery,and it plays an important role in the transportation of people and goods after the earthquake.Sometimes the track does not have obvious breakage after the earthquake,but the deformation of the track has already threatened the safety of running.Therefore,it is necessary to explore the response of ballastless track under earthquake and the influence of track deformation on running safety.In this paper,a typical high-speed railway bridge-track model was established using ANSYS software,and the seismic response of the ballastless track was analyzed.,and add the possible deformation of the track to the track of the car-rail model,calculate the three indicators of train running,and evaluate the running safety.The main work of this article are as follows:(1)The current research status of the impact of earthquake on the track and the effect of track deformation on the dynamic characteristics of the train are summarized.Combined with the parameters of the actual high-speed railway bridge structure,the appropriate elements are selected to establish a typical high-speed railway bridge-track finite element model.The method of modal analysis is introduced,and the first ten modes of the model are obtained by modal analysis.(2)This paper analyzes the earthquake response of the established bridge-track model,and explore the impact of different seismic waves,earthquake intensity and bridge pier height on the dynamic response of the track.The results shows that different seismic waves have different influences on the lateral and vertical displacement of the track.Under the same earthquake wave,when the earthquake intensity and bridge pier height increase,the maximum amount of track deformation is increasing.During the earthquake,the vertical displacement of the mid-span node is greater than the lateral displacement.(3)The process of establishing the vehicle-rail model is introduced in detail.The selected Chinese track spectrum is converted into track irregularity using the triangle series method,and the deformation form of the track is simulated and attached to the track.The amount of track deformation at different driving speeds is explored.Theeffect of track deformation on the three driving indicators at different driving speeds was explored.,the influence of the track deformation chord length on the three driving indicators under different track deformation amounts,and the influence of different track deformation forms on the three driving indicators,and the safety was evaluated.The results show that the three indicators of train running increase with the increase of the additional deformation of the track,increase with the increase of the driving speed,and decrease with the increase of the chord length of the track deformation;he vertical deformation of the track has more influence on the wheel load reduction rate than the lateral deformation,and the lateral deformation of the track has a greater influence on the lateral wheel-rail force than the vertical deformation;the different track deformation forms have different effects on the running safety,and the maximum allowable deformation is given.