A comparative analysis of the conservative bridge transition design approaches
Dareeju, Biyanvilage, Gallage, Chaminda, & Dhanasekar, Manicka (2014) A comparative analysis of the conservative bridge transition design approaches. In Schweiger, Robert (Ed.) Proceedings of the Conference on Railway Excellence: Rail Transport for Vital Economy, Railway Technical Society of Australasia (RTSA), Adelaide Convention Centre, Adelaide, SA, pp. 649-657.
Differential settlement at the bridge approach between the deck and rail track on ground is often considered as a source of challenging technical and economical problem. This caused by the sudden stiffness changes between the bridge deck and the track on ground, and changes in soil stiffness of backfill and sub-grade with soil moisture content and loading history. To minimise the negative social and economic impacts due to poor performances of railway tracks at bridge transition zones, it is important, a special attention to be given at design, construction and maintenance stages. It is critically challenging to obtain an appropriate design solution for any given site condition and most of the existing conventional design approaches are unable to address the actual on-site behaviour due to their inherent assumptions of continuity and lack of clarifying of the local effects. An evaluation of existing design techniques is considered to estimate their contributions to a potential solution for bridge transition zones. This paper analyses five different approaches: the Chinese Standard, the European Standard with three different approaches, and the Australian approach. Each design approach is used to calculate the layer thicknesses, accounting critical design features such as the train speed, the axle load, the backfill subgrade condition, and the dynamic loading response. Considering correlation between track degradation and design parameters, this paper concludes that there is still a need of an optimised design approach for bridge transition zones.
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|Item Type:||Conference Paper|
|Keywords:||Transition, Conservative Design Approach, Compression Analysis, Track Settlement, Layer Thickness|
|Divisions:||Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2014 [please consult the author]|
|Deposited On:||17 Jun 2014 22:15|
|Last Modified:||19 Jun 2014 21:35|
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