Australia's engineering heritage: life extension of the Sydney Central flying junction

Central Flying Junction is a key piece of rail infrastructure for both Sydney and NSW. The flyovers carry high volumes of rail traffic and thousands of commuters every day from different areas of Sydney into Central Station. Inspections of the flyovers revealed that elements of the structure were in questionable condition. Additionally, given the high usage equating to approximately 171 million axle loadings since opening in October 1926, there was a concern that the structure’s fatigue life may be limited. A specialised team of 5 engineers were tasked with conducting an investigation to accurately determine the remaining fatigue capacity of the flyovers. In-service data was collected from strain gauges installed by engineers on the flyovers and was used to validate a detailed Finite Element model which identified critical fatigue locations. While the majority of the flyover structure was found to have sufficient remaining fatigue life, several of the riveted girders were identified that had exceeded or were approaching their fatigue design life. A program of remedial and maintenance works was recommended including painting, bearing refurbishment and local girder strengthening to ensure a future service life of the Central Flying Junction of more than 50 years. Using a combination of advanced analysis and in-service testing, this small engineering team was able to successfully quantify the fatigue life of the Central Flying Junction, enabling the preservation of an asset with heritage value and avoiding an estimated replacement cost in excess of $150 million and preventing untold disruption to thousands of commuters.

Media Info

  • Pagination: 10p. ; PDF
  • Monograph Title: Permanent Way Institution (PWI) NSW, 2016 annual convention

Subject/Index Terms

Filing Info

  • Accession Number: 01636952
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: May 30 2017 3:33PM