ENVIRONMENTAL STRESSES IN FLEXIBLY SUPPORTED BRIDGES
At present, no rational design method is available to account for movements and stresses in composite-girder bridges supported by flexible stub abutments. Because flexible stub abutments are frequently used, the objectives of this study were to: 1) develop a method for calculating environmentally induced movements and stresses and 2) compare the magnitude of these stresses induced in three types of construction for a 11-26-26-11-m (35-86-86-35 -ft) four span six stringer composite-girder highway bridge located in mid-Missouri. Three types of support connections were investigated; 1) frictionless bearings, 2) non-integral end bents, and 3) integral end bents. Twenty years of recorded weather data were used for selection of upper and lower bound environmental loadings. Using these loadings as boundary conditions to the general heat flow equation, a finite element method was used to calculate resultant temperature distributions within a typical interior girder. These temperature distributions were then used as input to a slab-beam type element for calculation of the thermally induced stresses within the girder. Restraints imposed by the substructure, i.e. the bridge piers and earth embankments were modeled by linear springs. The results show that thermally induced stresses are significant for all three types of construction. Maximum beam stresse for the three supports were approximately 35%, 35%, and 52% of the allowable for frictionless bearings, non-integral abutments, integral abutments, respectively. /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:
- Hulsey, J Leroy
- Emanuel, Jack 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; References; Tables;
- Pagination: pp 262-270
- 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: Abutments; Bearings; Bents; Bridge design; Bridge substructures; Bridge superstructures; Bridges; Composite materials; Finite element method; Flexibility; Girders; Motion; Stresses; Structural design; Temperature
- Uncontrolled Terms: Bridge spans
- Old TRIS Terms: Composite girders
- Subject Areas: Bridges and other structures; Highways;
Filing Info
- Accession Number: 00183773
- Record Type: Publication
- ISBN: 0309026962
- Files: TRIS, TRB
- Created Date: Dec 12 1978 12:00AM