Revised railway provisions of the new bridge design standard

The Australian Bridge Design Code (AB DC) has been revised as an Australian Standard to be published in 2003 as AS 5100. Many of the railway provisions of the AB DC have been expanded, revised, and refined. The railway revisions to be discussed in this paper fall into the following categories. 1. Dynamic load allowance: The history of railways in Europe, America and Australia, related to dynamic load is first explained showing why Australia followed American standards rather than European standards in the past. Dynamic load allowance has been revised using strain gauging from many different types of transom top underbridges in NSW, then compared with similar testing with ballast top underbridges in USA and Canada. The basic European approach has been maintained, as it is superior to the ANZRC approach, which was based on AREA. The changes are required to allow for the lower standard of track and wheel condition in Australia, USA and Canada compared to Europe. The lower standard is due to the former countries constructing their systems as "pioneer lines", whereas Europe had the population density and short distances to afford higher standard lines. 2. Railway loading: A simple but necessary change has been made to simulate coupled six axle locomotives on medium length spans. 3. Protection from collision: Many alterations have been made to the provisions to protect bridges and structures from train collisions following derailments and collision between two trains. Most of these relate to allowing for structural redundancy rather than conventional pier and column protection. 4. Steel underbridges: Many changes have been made related to fatigue prevention, fatigue assessment and corrosion protection of steel underbridges. Examples are the ANZRC limits on slenderness ratio have been reinstated and fatigue life enhancement, which has been used on NSW underbridges for 35 years, but not mentioned in Australian standards, only overseas standards, has been addressed and referenced. 5. Rating of underbridges: The rating provisions have been amended to give appropriate rules for underbridge assessment.

Media Info

  • Pagination: 9p. ; PDF
  • Monograph Title: Cost efficient railways through engineering: CORE 2002: conference on railway engineering, November 10-13 2002, Wollongong, New South Wales, Australia

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Filing Info

  • Accession Number: 01532061
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Jul 29 2014 11:53AM