TAMAR BRIDGE STRENGTHENING AND WIDENING - A CASE STUDY

This paper describes engineering work on the strengthening and widening of the Tamar Bridge, which carries the A38 trunk road over the River Tamar between the county of Cornwall and the city of Plymouth in South West England. An assessment of the bridge in 1994 indicated that the anchorages, towers, and suspension systems were adequate for the projected live loading, that the road deck and stiffening trusses were significantly sub-standard, and the original concrete deck slab was beginning to deteriorate. Several interim measures were introduced to reduce stresses, and appropriate enhanced inspection and monitoring were introduced. In 1995, it was decided to commission a feasibility study into strengthening options which would keep the bridge open to traffic during the works. After this study, it was decided to replace the concrete bridge deck by a light steel orthotropic deck, and use similar construction for the new cantilever decks needed to provided a limited increase in capacity for local traffic, public transport, cyclists, and pedestrians. The new cantilever steel orthotropic deck panels would be welded to the truss top chords, to give them the extra strength needed during construction and greater durability. Various other works were needed, including span strengthening and approach road widening. For the covering abstract see IRRD E104152.

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  • Corporate Authors:

    Thomas Telford Limited

    London,   United Kingdom 
  • Publication Date: 1999

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00788364
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-2841-5
  • Files: ITRD
  • Created Date: Mar 3 2000 12:00AM