SIZE ISN'T EVERYTHING

This article describes some of the many interesting innovations in bridge engineering, which are being developed for short-span road bridges. With increasing traffic volumes and vehicle weights, cost- effective bridges of greater strength and durability are required. There is more choice of materials and structural methods for bridges; steel, pre-cast and in-situ concrete, timber, and advanced composite materials are all available. Recent innovations for short-span bridges have been developed in various parts of the world, and include: (1) a new type of shear connector, using an inverted steel T-section with holes, cast into concrete, that makes steel/concrete composite bridges more competitive; (2) a timber-concrete composite bridge, with glue- laminated wooden beams supporting a concrete slab; (3) an advanced composite road bridge, with a lifting structure that can accommodate and support 40t lorries; (4) a design for a concrete bridge deck that uses no reinforcing steel; and (5) an improved method for strengthening bridge columns, where high-strength synthetic fibres, saturated with an epoxy resin, are wrapped around the columns. Some representative examples are given of bridge engineers' views on steel versus concrete.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00713407
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Nov 22 1995 12:00AM