EXTERNAL PRESTRESSING FOR BRIDGE REHABILITATION IN ITALY

The Italian motorway network was built about 20 to 30 years ago; it has a large number of prestressed concrete viaducts often located in mountain regions where deicing salts are used. Most of these bridges must now be rehabilitated. The main reasons for the rehabilitation, besides the use of salts, are (a) the increased live loads, (b) the insufficient knowledge of seismic problems at the time that the bridges were built, (c) underestimation at the time of building of the effects of time on the concrete, and in some cases, (d) the poor quality of the construction. External prestressing has been found to be a powerful tool for repair work; therefore, it is used extensively in Italy. Three stages in the evolution of this technique can be focused: (a) the additional cables are embedded in new concrete and are added and attached to the old concrete, (b) the cables remain external to the original section with few points of contact with the deck; the wires or the strands are encased in high-density polyethylene pipes that are grouted with cement mortar (no petroleum wax or grease has been used in Italy until now), and (c) the cables are composed of single sheeted and greased strands located inside a high-density polyethylene pipe that is not grouted; each strand acts as a unit and can be easily replaced. Three examples, one for each of the techniques, are provided.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/conf/1995/cp7/cp7v2-022.pdf
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  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309061091
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  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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  Transportation Research Board

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• Authors:
  • Petrangeli, M P
• Conference:
  • Fourth International Bridge Engineering Conference
  • Location: San Francisco, California
  • Date: 1995-8-28 to 1995-8-30
• Publication Date: 1995

Language

• English

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 213-218
• Monograph Title: FOURTH INTERNATIONAL BRIDGE ENGINEERING CONFERENCE, SAN FRANCISCO, CALIFORNIA, AUGUST 28-30, 1995. CONFERENCE PROCEEDINGS, 2 VOLUMES
• Serial:
  • Transportation Research Board Conference Proceedings
  • Issue Number: 7
  • Publisher: Transportation Research Board
  • ISSN: 1073-1652

Subject/Index Terms

• TRT Terms: Case studies; Conferences; Driver rehabilitation; Prestressed concrete bridges; Prestressing; Viaducts
• Uncontrolled Terms: External prestressing; Rehabilitation
• Geographic Terms: Italy
• Subject Areas: Highways; Maintenance and Preservation; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 00711727
• Record Type: Publication
• ISBN: 0309061091
• Files: TRIS, TRB
• Created Date: Sep 6 1995 12:00AM