Abstract
The line track bearings used in the Yeoungjong Grand Bridge experienced cracks and deformations, which result in significant accelerations and displacements of the track. This study measured an acceleration and a displacement of 0.5 g and 0.5 mm, respectively. Three-dimensional finite element analysis was performed to predict the behavior of railway tracks. However, when low-maintenance cylindrical bearings were used instead of line bearings, the displacement was decreased by 93%, and the acceleration was decreased by 82%. Furthermore, it turned out that the maximum displacement of the track girder was decreased by 45% when cylindrical bearings were used.
Highlights
Bridge bearings applied to a railway bridge are installed on a bridge deck, and they need to have a means of generating resistance to negative reaction forces to support a track and rails installed on top of the bridge
The results showed the highest dynamic behavior with line bearings, and there was a difference in the amount of lifting at fixed and movable ends with disc bearings
In consideration of the separation distance between the anchoring plate of the line bearing and the upper flange of the track girder, a 0.51 mm displacement was set to be caused by the negative reaction force
Summary
Bridge bearings applied to a railway bridge are installed on a bridge deck, and they need to have a means of generating resistance to negative reaction forces to support a track and rails installed on top of the bridge. Line bearings have a small bearing area for bearing support, which is likely to cause local damage to the bridge structure during load transfer. These bearings have a short maintenance cycle owing to the wear of the joint, as all members that make up line bearings are made of steel [3]. These line bearings are used in a fixed end, in a movable end of less than 40 mm, or where the reaction force is not large
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