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Title: USE OF HIGH-STRENGTH CONCRETE IN PRESTRESSED CONCRETE BOX BEAMS FOR HIGHWAY BRIDGES
Accession Number: 00603587
Record Type: Component
Availability: Find a library where document is available Abstract: A study was conducted to determine the structural and economic benefits of using high-strength (6,000 to 12,000 psi) concrete in box beams for highway bridges. The goal was to establish a range of application of various beam designs in terms of span capacity. The study focused on long-span, simply supported, prestressed concrete box beams. The application of high-strength concrete was investigated in two ways. First, high-strength concrete was substituted for normal-strength concrete in the design of standard beam sections. Second, to improve structural performance, modifications were made to the geometry of the standard beams in conjunction with use of the high-strength material. In both cases a parametric study was performed to identify the most structurally efficient designs. Results indicate that the maximum attainable span of the box beam can be significantly increased by using high-strength concrete in conjunction with a modified internal void shape. In addition, attainable span lengths were generally longer and had 1/2-in. rather than 0.6-in. strands for the beam sections studied. Those designs found to provide the greatest structural benefit were subsequently examined for their relative cost-effectiveness. Comparisons were made on the basis of a total superstructure cost per square foot of bridge deck. For shorter span lengths, spread box beams 3 ft wide were found to be the most cost-effective. For longer spans, the 4-ft-wide adjacent box sections were less costly. Strand size does not appear to significantly influence the cost of a box beam.
Supplemental Notes: This paper appears in Transportation Research Record No. 1275, Bridge Research 1990. 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
Monograph Title: Monograph Accession #: 01411073
Authors: Schemmel, John JZia, PaulPagination: p. 12-18
Publication Date: 1990
Serial: ISBN: 0309050618
Features: Figures
(9)
; References
(7)
; Tables
(3)
TRT Terms: Uncontrolled Terms: Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls
Files: TRIS, TRB, ATRI
Created Date: Feb 28 1991 12:00AM
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