| As it is economical, high performance, safe and a fast traffic communication, elevated rail transit is used intensively in the world wide. At present, with excellent stability, fitting busy line and low maintenance workload, ballastless track is put into use on a world scale in elevated rail transit. Supporting block track is a new pattern of ballastless track structure and is first used in Shanghai Mingzhu Line, which make a lot of economic returns. Rail transit in our country is now in a rapidly construction and development period, so the application of supporting block track has a bright future. Based on comprehensive investigation and documents, the paper takes the supporting block track as research object, researching its dynamic characteristic from ideas of systemic and an overall consideration of wheel-rail, tract-bridge interaction. The main research contents of this paper are as follows:1. Make a conclusion of track pattern choosing in elevated rail transit and introduce the application, advantages and disadvantages, structure composition of supporting block track, low vibrate track and floating slack track. Sum up the research of train-track-bridge coupling dynamic interaction.2. Introduce the critical skills in ABAQUS and establish train-track-bridge dynamic element finite model. Make modal analysis of the above model and get the first 10-step natural frequency and relevant mode vibration. Verify the reliability of the model by comparing the simulation result with the site test result.3. Analyze the dynamic characteristic of supporting block track with domestic and foreign relevant evaluation indicator from the aspects of train, track and bridge. Study the effect of structural parameters changing on the dynamic characteristic.4. Establish train- low vibrate track-bridge finite element model and analyze the dynamic characteristic of the track with the simulation result. Study the effect of different block supporting pattern on the dynamic characteristic.
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