| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 95 === With the trend of increasing speed and capacity, the railway structures are facing more and more challenges. When the train speed approach the critical wave velocities of the track structure, the deformations of track systems may increase dramatically due to resonance and result in track failure and even derailments. This study applied the finite element analysis package, ABAQUS, to model track structures loaded by high speed moving suspended mass to investigate the interactions among track structure parts and track responses.
The results of this study showed that raising train speed may significantly increase track vibrations. When the train speed approached the critical velocity of the track system, the analysis considering multiple axle loads illustrated different train-track behavior from the results with single moving axle. It was also concluded that stiffening track rigidity by improving subgrade quality is a cost-efficient way to cope with the challenges on track structures in the high-speed railway transportation era.
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