Bridge support and protection for a major ocean outfall sewer under extreme aircraft loading

Sydney Airport Corporation Limited requires the inclusion of a runway end safety area (RESA) at the western end of one runway as part of a safety upgrade to cater for the new A380 aircraft and comply with the mandatory requirements of the Civil Aviation Safety Authority. In order to include the required 90 m by 90 m extension to the end of the runway, existing infrastructure within this area requires protection or support using extensive bridge structures. An existing above ground sewer known as the South Western Suburbs Ocean Outfall Sewer (SWSOOS) requires an overhead bridge protection structure that forms the surface of the RESA and in another location requires support where the new realigned airport perimeter road crosses under the SWSOOS. The new overhead bridge structure forming the RESA also extends over the perimeter road. The SWSOOS comprises a 20 m wide three celled reinforced concrete structure, 2.5 m in height and supported on precast driven piles located at a spacing of approximately 3 m. This heritage listed rigid structure was constructed in 1938 and remains in continuous operation. The bridge structure over the SWSOOS which supports the RESA is subjected to extreme live loads exerted when aircraft under full braking conditions enter the RESA. This paper presents the make-up of these loads as well the design of the deck protection structure to account for these loads. This paper also covers the design development of the support structure for the SWSOOS which comprises a large longitudinally and transversely posttension beam and Slab Bridge, constructed under the SWSOOS. Unlike most bridge structures this structure is designed for control of deflections as it replaces the original support piles. An assessment methodology to determine the allowable deflections the existing SWSOOS can accommodate is also presented.

Language

  • English

Media Info

  • Pagination: 11p
  • Monograph Title: Innovation in engineered wood product bridge components

Subject/Index Terms

Filing Info

  • Accession Number: 01384430
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 22 2012 4:34PM