The use of precast thin webs in the construction of prestressed concrete long-span box girder bridges is proposed as a possible economy measure. Normally the difficult placement of the deep webs accounts for a high proportion of the overall cost. It is suggested that the webs should be precast in sections with the prestressing tendons confined to in-situ top and bottom flanges. This form of construction is illustrated in the design of a new bridge carrying the A1 over the river Loquet valley in Northumberland. Laboratory tests have been carried out to determine the behaviour of the precast web/in-situ flange junction. As a result it was decided to expose the aggregate on the web over the area of the interface. A quarter scale model of the thin-webbed box showed satisfactory web stability and shear transfer between the vertical joints in the web panels. /TRRL/

  • Corporate Authors:

    Department of the Environment

    Room 1640 Lunar House, 40 Wellesley Road
    Croydon CR9 2EL,   England 
  • Authors:
    • BRIDLE, R J
  • Publication Date: 1977-3


  • English

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 30-31
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00163983
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Dec 27 1977 12:00AM