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Title:

BEHAVIOR OF REINFORCED CONCRETE SLAB BRIDGES DURING AND AFTER REPAIR

Accession Number:

00670473

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309055229

Abstract:

Three three-span bridges with various levels of deterioration were tested before and after repair to understand the behavior during repair, the possibilities for permanent moment redistribution to bottom reinforcement as a result of the repair, and the effectiveness of the repair method. The stiffness was found to be smaller while the specimens were being repaired, particularly when the deteriorated shoulders had to be cut. If the shoulder was originally ineffective because of excessive damage, the response was not changed after its removal. For the specimen with the most damage, the stiffness during variable depth removal became appreciably smaller than the prerepair value. The maximum postrepair deflection of this bridge was only 2% less than that of its prerepair counterpart; that is, the repair method did not enhance structural performance. The postrepair stiffnesses of the other bridges were 11 and 40% larger than the prerepair values, but for all three bridges the largest deflection was only 1/3,100 of the span length. While under repair a larger portion of the moment was resisted by the bottom reinforcement, but it was still less than the available moment capacities. After repair the top bars contributed more toward resisting the loads. However, the repair method did not always restore the contribution of the top bars for the bridge with the most extensive damage. The ratings of the repaired bridges were increased because of (a) reduced dead loads from removal of the existing asphalt overlay, (b) increased capacity, and (c) the larger strength factors that could be used.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1442, Maintenance of the Highway Infrastructure. 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 Accession #:

01401265

Language:

English

Authors:

Shahrooz, Bahram M.
Miller, Richard A
SARAF, V K
Godbole, B

Pagination:

p. 128-135

Publication Date:

1994

Serial:

Transportation Research Record

Issue Number: 1442
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309055229

Features:

Figures (7) ; Photos (6) ; References (4) ; Tables (2)

Subject Areas:

Bridges and other structures; Design; Highways; Maintenance and Preservation; I24: Design of Bridges and Retaining Walls; I60: Maintenance

Files:

TRIS, TRB

Created Date:

Dec 23 1994 12:00AM

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