THIN PRECAST WEBS FOR CONCRETE BOX BRIDGE

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

Language

• English

Media Info

• Features: Figures; Photos;
• Pagination: p. 30-31
• Serial:
  • DOE Construction
  • Issue Number: 21

Subject/Index Terms

• TRT Terms: Aggregates; Beams; Box girders; Bridge design; Bridges; Construction; Construction management; Costs; Interfaces; Joints (Engineering); Precast concrete; Prestressed concrete; Shear strength; Shear stress; Stability (Mechanics); Structural design; Webbing
• Uncontrolled Terms: Construction costs; Shear transfer
• Old TRIS Terms: Transfer (Mech)
• ITRD Terms: 4577: Aggregate; 3472: Beam; 3474: Box girder; 3455: Bridge; 3666: Construction method; 224: Cost; 5429: Interface; 2998: Joint (structural); 4792: Precast concrete; 4796: Prestressed concrete; 5531: Shear; 5930: Stability; 6731: Transfer (phys)
• Subject Areas: Bridges and other structures; Construction; Finance; Geotechnology; Highways; I53: Construction of Bridges and Retaining Walls;

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