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Keywords: railway bridge end, railway maintenance, bridge approach, ballast glue, ballast bond, dynamic response, vibration suppression, track-bridge systems.

Summary

Accelerated deterioration of railway bridge approaches often induces downtime or restricted railway operation; and importantly causes more frequent maintenance, which is costly and time-consuming. Such deterioration is believed to occur because of high dynamic impact loading from: the difference of stiffness between the railway track and the bridge; and the poor condition of the track support at the bridge ends. The abrupt change in track stiffness often causes accelerated degradation of the track geometry and components and poor ride quality, demanding higher maintenance. There are a number of improvement programs that have been implemented in order to provide a smooth transition of the stiffness interface. In general, the transitions were designed to either:

Provide a gradual increase in the stiffness of ballasted track to match that of the stiffer track (stiffness ramping); or
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.

The field study described in this paper demonstrates an application of ballast glue/bond to improve the smoothness of stiffness along the ballasted track at bridge ends. The method appears to be useful for brown-field maintenance where adjacent aged infrastructure exists. The ballast glue/bond should reinforce the ballasted track stiffness through the aggregate adhesion whilst the drainage property of the ballast is not undermined. The field trail was conducted at a railway bridge in Windsor, NSW Australia. This paper presents the field performance and the dynamic behaviour and responses of railway bridge ends improved by the ballast glue/bond. The results show that the ballast glue/bond suppresses vibrations at high frequencies but excites the track resonances in low frequency range.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 75 Dynamic Responses of Railway Bridge Ends: A Systems Performance Improvement by Application of Ballast Glue/Bond S. Kaewunruen^1,2 ¹RailCorp - Transport for NSW, New South Wales, Sydney, Australia ²Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, USA doi:10.4203/ccp.104.75 purchase the full-text of this paper Full Bibliographic Reference for this paper S. Kaewunruen, "Dynamic Responses of Railway Bridge Ends: A Systems Performance Improvement by Application of Ballast Glue/Bond", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 75, 2014. doi:10.4203/ccp.104.75 Keywords: railway bridge end, railway maintenance, bridge approach, ballast glue, ballast bond, dynamic response, vibration suppression, track-bridge systems. Summary Accelerated deterioration of railway bridge approaches often induces downtime or restricted railway operation; and importantly causes more frequent maintenance, which is costly and time-consuming. Such deterioration is believed to occur because of high dynamic impact loading from: the difference of stiffness between the railway track and the bridge; and the poor condition of the track support at the bridge ends. The abrupt change in track stiffness often causes accelerated degradation of the track geometry and components and poor ride quality, demanding higher maintenance. There are a number of improvement programs that have been implemented in order to provide a smooth transition of the stiffness interface. In general, the transitions were designed to either: Provide a gradual increase in the stiffness of ballasted track to match that of the stiffer track (stiffness ramping); or 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. The field study described in this paper demonstrates an application of ballast glue/bond to improve the smoothness of stiffness along the ballasted track at bridge ends. The method appears to be useful for brown-field maintenance where adjacent aged infrastructure exists. The ballast glue/bond should reinforce the ballasted track stiffness through the aggregate adhesion whilst the drainage property of the ballast is not undermined. The field trail was conducted at a railway bridge in Windsor, NSW Australia. This paper presents the field performance and the dynamic behaviour and responses of railway bridge ends improved by the ballast glue/bond. The results show that the ballast glue/bond suppresses vibrations at high frequencies but excites the track resonances in low frequency range. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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