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Title: FIBER-REINFORCED POLYMER SHEAR STRENGTHENING OF SHORT-SPAN, PRECAST CHANNEL BEAMS IN BRIDGE SUPERSTRUCTURES
Accession Number: 00984607
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: A national study concluded that at least 14 states use precast channel beams for their bridge superstructures. Before the mid-1970s short-span (19-ft) precast channel beam bridges were designed by the Arkansas State Highway and Transportation Department for H15 loading without any provision for shear reinforcement. A recent statewide survey has identified 389 of these bridges that remain in service. About 3% are load posted. Approximately one-third of the 389 bridges are exhibiting deterioration that may be serious. During a recent investigation by the University of Arkansas, 33 precast channel beams were evaluated for structural strength. It was determined that many of these units have inadequate shear capacity. A shear crack frequency distribution curve was developed through examination of the 33 tested beams. A simple shear strengthening technique is presented consisting of fiber-reinforced polymer (FRP) strips as external stirrups. The technique has been developed so that it can be easily implemented in the field. The FRP strips are spaced to prevent the full formation of a diagonal crack between two adjacent strips and designed to ensure a flexural failure rather than a sudden shear failure. Four beams retrofitted with the proposed retrofit technique and two control beams were load tested to failure to evaluate the effectiveness of the technique. Results from the experiment show that the retrofitted beams exhibited at least a 290% increase in deflection ductility and a 418% increase in energy ductility.
Supplemental Notes: This paper appears in Transportation Research Record No. 1892, Design of Structures 2004.
Monograph Title: Monograph Accession #: 00984600
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Jones, J XHeymsfield, EDurham, S APagination: p. 56-65
Publication Date: 2004
Serial: ISBN: 0309094879
Features: Figures
(6)
; Photos
(7)
; References
(19)
; Tables
(3)
TRT Terms: Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls
Files: TRIS, TRB, ATRI
Created Date: Jan 25 2005 12:00AM
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