Design of integral and high skew box girder bridges: SH18 Hobsonville Deviation, Auckland

The SH18 Hobsonville Deviation and SH16 Brigham Creek Extension Project form part of the Upper Harbour Corridor extension for the Auckland Western Ring Route. The project includes a total of six vehicle traffic bridges which consist of five integral super-t bridges and a concrete box girder bridge. The five super-t bridges are designed as fully integral structures with no articulation or movement joints at either piers or abutments. This was done to reduce maintenance costs, in recognition of whole-of-life benefits, by eliminating girder bearings and expansion joints which both have a significantly shorter life expectancy than the bridge structure themselves. The highway alignment of the concrete box girder bridge requires a two span structure on a skew angle of approximately 67 degrees with a varying deck width. The deck was designed as two separate cast insitu post tensioned concrete box girders. The length of the concrete box girders sections vary with bridge skew and splay from 35m to 45m The deck is integral with the central pier and has pot bearings and expansion joints at the abutments. (a) For the covering entry of this conference, please see IRRD abstract no. E218160.


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  • Accession Number: 01143980
  • Record Type: Publication
  • Source Agency: TRL
  • Files: ITRD, ATRI
  • Created Date: Nov 16 2009 12:18PM