INVESTIGATION OF THE ULTIMATE STRENGTH OF DECK SLABS OF COMPOSITE STEEL/CONCRETE BRIDGES
A theoretical and experimental study of the ultimate strength of the deck slab of composite I-beam bridges is summarized. A theory, based on a mechanical model proposed by Kinnunen and Nylander, for punching failure of simply supported slabs, is developed which permits the calculation of the punching strength of restrained slabs. The theory suggests that a deck slab can be expected to have a high inherent strength due to boundary restraints ensured by the presence of shear connectors, beams, diaphragms and the neighbouring slab areas. One-eighth scale direct models of a 24.4 m (80 ft) span prototype bridge were tested in laboratory studies of both orthotropically and isotropically reinforced slabs. Shear connector behaviour and dead load stresses appropriate to unshored construction were simulated. The results of the tests show that conventionally reinforced deck slabs have very high factors of safety against failure by punching and are wastefully reinforced. From considerations of ultimate strength as well as shrinkage and temperature reinforcement requirements, 0.2 per cent isotropic reinforcement is recommended as being adequate for bridge slabs of the type studied. Although this amounts to approximately 30 per cent of the current reinforcement requirements for such slabs, a high factor of safety can still be expected. /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:
- Batchelor, Barrington DeV
- Hewitt, Brian E
- Csagoly, P
- Holowka, M
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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 162-170
- 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: Beams; Bridge decks; Composite materials; Concrete; Concrete bridges; Girder bridges; Isotropy; Metal bridges; Prototypes; Safety; Shrinkage; Simulation; Slabs; Slurry; Steel bridges; Tests; Ultimate strength
- Uncontrolled Terms: Composite beams
- Old TRIS Terms: Deck girder bridges; Slurries
- Subject Areas: Bridges and other structures; Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00183760
- Record Type: Publication
- ISBN: 0309026962
- Files: TRIS, TRB
- Created Date: Dec 3 1978 12:00AM