AN END TO SEVEN YEARS OF TROUBLE

This article deals with Tinsley viaduct, the original design of which was based on a series of simply supported prestressed concrete spans with a massive steel girder running down its spine. However, it was never built as such and a continuous 12,000 t steel double-decked viaduct was constructed. A design check revealed the need for strengthening the columns, the diaphragms in both longitude boxes and the supports. Straightforward stiffening of the viaducts boxes with new plates was found to be difficult, and to relieve loads by elastic sharing would mean that the necessary additional plates would have been impractically thick. Temporary propping of spans was considered until thinner plates were introduced, but this was found to be too expensive. Details are given of the design of the "coat-hanger" scheme, where new cross boxes were to span between the main longitudinal box beams on each side of each main cross box. The article concludes by explaining that reinforcement of the diaphragms above the column support would reduce their flexibility, and compression stresses in the lower bars were found to be unacceptably high. The "coathanger" scheme was abandoned at the end of 1973. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03077683
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • WALKER, M
• Publication Date: 1975-6-26

Language

• English

Media Info

• Features: Figures;
• Pagination: p. 23
• Serial:
  • NEW CIVIL ENGINEER
  • Issue Number: 149
  • Publisher: EMAP CONSTRUCT LIMITED
  • ISSN: 0307-7683

Subject/Index Terms

• TRT Terms: Box girders; Bridge design; Bridge members; Bridge piers; Bridges; Compression; Design; Improvements; Length; Material reinforcement; Prestressed concrete; Steel structures; Strength of materials; Structural design; Structural diaphragms; Structural plates; Viaducts
• Uncontrolled Terms: Bridge spans; Longitudinal; Plates; Stiffening
• Old TRIS Terms: Diaphragms
• ITRD Terms: 3474: Box girder; 3455: Bridge; 3434: Bridge pier; 9011: Design (overall design); 9108: Improvement; 5544: Strength (mater)
• Subject Areas: Bridges and other structures; Construction; Design; Highways; I53: Construction of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00127906
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Dec 29 1975 12:00AM