Research on Static and Dynamic Adaptability of Ballastless Tracks on Multi-long-span Steel Truss Bridge
Research purposes:In order to study the adaptability of ballastless tracks on multi-long-span steel truss bridge,taking the Zhengzhou-Jinan High-speed Railway Yellow River Bridge as the research object,based on the theory of track-bridge interaction and vehicle-bridge coupling vibration,the spatial refined finite element model of long-span steel truss bridge and ballastless track was established,and then the static and dynamic adaptability of ballastless tracks on long-span steel truss bridge was analyzed.Research conclusions:(1)The seamless line strength,deformation coordination,static track irregularity and traffic performance indexes meet the specification requirements,and the static-dynamic adaptability is good.(2)The temperature gradient has a significant effect on interlayer compression and sliding of fasteners,and the two indexes increase by 51.08%and 50.00%,respectively.(3)The temperature gradient degrades the track static irregularity,the value of 10 m chord and 30 m chord increase by 144.12%and 76.06%,respectively,while the 60 m chord remains basically unchanged.(4)The additional deformation has little effect on the vibration response,but it has significant effect on wheel load reduction rate.
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