SOME CONSIDERATIONS IN WIDENING AND REHABILITATION OF BRIDGES
Bridge rehabilitation, whether required for repairs, strengthening, or widening, requires an insight into unique structural problems. These problems are compounded if modifications must be accomplished while maintaining traffic and if modifications alter the structural characteristics of the existing structure. This paper deals with solutions employed on two widening and rehabilitation projects. Widening the Hackensack River Bridge on the New Jersey Turnpike required integrating the superstructure with the existing superstructure. Techniques of jacking the widening main members against the existing system, inducing compatible cambers and ensuring proper load distribution, are described. This paper describes foundation additions to main river piers which were integrated by temporarily leaving a gap between the foundations. This permitted elastic shortening of new piles under pier dead load, and prevented overloading the existing piles. A classic example of fatigue failure is illustrated. Welding of fills caused a geometrical notch at the toe of welds, producing a crack through the main members of brackets and floorbeams. Widening the I-83 bridge over the Susquehanna River in Harrisburg required an inspection which revealed rivet failures at bracket tie plates. These failures appear to correlate with findings by researchers at Lehigh University (1). Unfastening the bracket tie plates from the main girders is discussed as well as other design considerations resulting from unfastening tie plates near the girder supports. /Author/
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0309026962
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Supplemental Notes:
- This paper appeared in Transportation Research Record No. 664, Bridge Engineering, Volume 1. Proceedings of a conference conducted by the Transportation Research Board, September 25-27, 1978. 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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Authors:
- Soto, M H
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Conference:
- Bridge Engineering Conference, 1st, 1978, St Louis, Missouri, USA
- Location: St Louis Missouri, United States
- Date: 1978-9-25 to 1978-9-28
- Publication Date: 1978
Media Info
- Media Type: Print
- Features: Figures; Photos; References; Tables;
- Pagination: pp 56-63
- Monograph Title: Bridge Engineering. Volume 1
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Serial:
- Transportation Research Record
- Issue Number: 664
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Curvature; Driver rehabilitation; Failure; Fatigue (Mechanics); Foundations; Fracture mechanics; Load transfer; Pavement widening; Structures; Superstructures; Support piles
- Uncontrolled Terms: Rehabilitation; Widening
- Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation;
Filing Info
- Accession Number: 00183747
- Record Type: Publication
- ISBN: 0309026962
- Files: TRIS, TRB
- Created Date: Dec 3 1978 12:00AM