# Influence Analysis of Traveling Wave Effect on Rail Interaction of Long-Span Suspension Bridge
## 1 Introduction  
As the span of railroad bridge increases, the bridge structure gradually becomes more flexible, and a small disturbance of the girder body will also produce larger displacement and turning angle of the girder end, which will have a greater adverse effect on the rail and ballast layer laid on it [1, 2]. At present, the force performance of the rail system on simply supported girder bridge, large-span arch bridge and cable-stayed bridge has been studied more, however, there are fewer research results on seamless lines on kilometer-class suspension bridges. Some scholars have studied the force performance and deformation conditions of seamless lines on bridges under earthquake effects. [PERSON] [3] took multi-span standard simply supported girder bridges as the research object to study the influence of track constraints on the aseismic performance of bridges, and the results show that track constraints should be considered in the seismic design of railway bridges. [PERSON] [4] studied the seismic response law of the simply supported beam bridge-track system under the traveling wave effect, and found that when the apparent wave velocity is small, the influence of the traveling wave effect should be considered even for the simply supported beam bridge, and the traveling wave effect will greatly increase the beam body and the seismic response of the substructure; the response of the track is incredibly sensitive to traveling wave effects. [PERSON] [5] studied the longitudinal seismicresponse of seamless lines on long-span continuous rigid-frame bridges under consistent excitation from the perspective of track stress and deformation, and suggested that the seismic force of the rail be added to the seamless lines on bridges in earthquake-stricken areas. [PERSON] [6] explored the effect of ground vibration on its track system by taking a 156 m large-span simply supported steel truss bridge as an example, and the traveling wave effect of ground vibration was considered. [PERSON] [7] used a large-span tied-arch continuous girder bridge with a main span of 112 m as a background for a detailed analysis of the response of its track system under seismic action. [PERSON] [8] used the Wufengshan Yangtze River Bridge as the engineering background and established its beam-track integrated spatial analysis model with ANSYS to analyze the seismic response of the beam-track system, but the model did not consider the expansion device of the bridge and ignored the traveling wave effect of ground vibration. [PERSON] and [PERSON] [9] discusses the properties of related materials. [PERSON] [10] used a public-rail suspension bridge with a main span of 1120 m as a background to investigate the safety of trains traveling on suspension bridge bridges under earthquake effects, and the results showed that not considering the traveling wave effect would seriously underestimate the safety index of trains traveling. At present, the research on the force performance and deformation of seamless lines on bridges under earthquake has not yet formed a certain standard, and there are few research results on the seismic response of rail system on railroad suspension bridges, so it is necessary to investigate the seismic response of the rail system of suspension bridges. Although [PERSON] [8] established a spatial analysis model of the integrated beam and rail system of the Wufengshan Yangtze River Bridge with ANSYS and carried out a detailed analysis of the seismic response of the beam and rail system, the model did not consider the beam end expansion device and only considered the consistent excitation of ground vibration, ignoring the traveling wave effect. Therefore, this paper takes the Wufengshan Yangtze River Bridge, the longest high-speed railway suspension bridge in China, as the engineering background, and establishes the integrated spatial finite element dynamic analysis model of the rail-bridge through ANSYS.