Widening of Western Distributor viaduct in Sydney NSW

The existing viaduct is a complex structure and was designed in 1967. It is 507 metres long and consists of 19 spans of varying length from 23 to 30 meters. The width of the deck also varies. The superstructure is a reinforced concrete multicellular deck with a prestressed concrete diaphragm at each pier. This superstructure is continuous over two or three piers and has seven drop-in spans supported by half joints. The substructure consists of two reinforced concrete columns connected by either hemispherical bearings or built into the superstructure. The paper describes the design of the viaduct widening and a developed unique scheme to support this widening. This scheme eliminated the need to strengthen the existing structure and overcame many site constraints. The widening is 271 meters long with variable width from 2.3 to 5.5 meters and consists of steel structure supported on reinforced concrete corbels. Each pair of corbels was clamped to the existing column using stress bars. The widening was constructed under traffic conditions. (a) For the covering entry of this conference, please see IRRD abstract no. E218160.


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  • Accession Number: 01143972
  • Record Type: Publication
  • Source Agency: TRL
  • Files: ITRD, ATRI
  • Created Date: Nov 16 2009 12:17PM