Skip to main content
Article
Effectiveness of soft baseplates and fastenings to mitigate track dynamic settlement at transition zone at railway bridge approaches
Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance (2016)
  • Sakdirat Kaewunruen
  • A Remennikov, University of Wollongong
  • Akira Aikawa
Abstract

Railway bridge approaches or bridge ends often suffer from a combination of dynamic wheel/rail interaction and poor formation compaction due to construction difficulties at the location, resulting in an initial short-wavelength track settlement at the first few sleeper bays near the bridge over a short period under revenue services. This settlement then further induces impact loading that aggravates the differential settlement, causing downtime or restricted railway operation; and importantly more frequent maintenance, which is costly and time-consuming. Principally, the stiffness transition zones can be optionally designed to either: (1) provide a gradual increase in the stiffness of ballasted track to match that of the stiffer track (stiffness ramping); or (2) equalise the stiffness and rail deflection, usually by controlling the resilience of rails on the stiffer track, or by adding more resiliency to the stiffer track.

 
This field study demonstrates an application of special soft baseplates and fastening systems to isolate the dynamic conditions transferring from transom steel bridge to the ballasted track at the bridge ends. The method appears to be useful for both green- and brown-field maintenance approaches. The soft baseplates can filter dynamic impact content from the aggressive loading conditions and provide longer-wavelength load redistribution over railway track infrastructure. The field trail was conducted at a railway bridge in New South Wales, Australia. This paper presents the field performance and the dynamic behaviour and responses of railway bridge ends improved by the soft baseplates and fastenings. Based on the vibration measurements, the new bridge end improvement method can well suppress vibrations at the bridge ends. The data shows that the lesser vibrations are transferred to ballast layer. In addition, the track geometry data from track inspection vehicle ‘AK Car’ shows a slower deterioration process at the bridge end.
Keywords
  • railway bridge end,
  • railway maintenance,
  • bridge approach,
  • soft basepates,
  • soft fastening systems,
  • dynamic responses,
  • vibration suppression,
  • track-bridge systems
Publication Date
April 8, 2016
DOI
10.4203/ccp.110.197
Publisher Statement
S. Kaewunruen, A.M. Remennikov, A. Aikawa, "Effectiveness of Soft Baseplates and Fastenings to Mitigate Track Dynamic Settlement at Transition Zones on Railway Bridge Approaches", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 197, 2016. doi:10.4203/ccp.110.197
Citation Information
S. Kaewunruen, A.M. Remennikov, A. Aikawa, "Effectiveness of Soft Baseplates and Fastenings to Mitigate Track Dynamic Settlement at Transition Zones on Railway Bridge Approaches", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 197, 2016. doi:10.4203/ccp.110.197