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Title:Structural Condition Assessment and Service Load Performance of Deteriorated Pretensioned Deck Beam Bridges
Author(s):Hawkins, Neil M.; Fuentes, Juan B.
Subject(s):Deck beam bridge, pretensioned beam, stiffness, cracking, strength, deterioration, corrosion, visual assessment.
Abstract:Three 30-year old deteriorated pretensioned deck beams were removed from an existing bridge in Illinois and re-assembled in the laboratory into a bridge sub-assemblage. Non-destructive and destructive tests and evaluations of the three beams were made in three phases: (1) Detailed visual condition assessments of the as-delivered beams; (2) The service load performance under truck type loadings of a bridge sub-assemblage constructed with the three beams; and (3) The strength and ductility of the individual beams in tests to failure. detailed descriptions are provided of the results of each study, of deterioration assessments made by two independent contractors, of coupon tests on prestressing steel and concrete samples taken from the beams, and of the chloride profiles measures through the soffit and sides of the beams. Theoretical aspects of the response of deck beam bridges, including the modeling of the response of the sub-assemblage, were studied. A method based on the beam on elastic foundation theory was developed to replicate the effects of changing the stiffness of the longitudinal joint between beams. Using that procedure bending moments in individual beams along and across the width of a bridge, inter girder shear forces, and beam deflections were calculated and deflections compared with those measures experimentally on the sub-assemblage. With that method appropriate load distribution factors for deteriorated existing deck beam bridges can be calculated. The condition of the transverse tie rod was found to be critical to service load performance. Cracking to the longitudinal joint had little effect on the stiffness of a bridge provided the transverse tie rod was snug. However, loss of snugness with time or corrosion increased substantially the potential for overloading a deteriorated beam.
Issue Date:2003-05
Genre:Technical Report
Publication Status:published or submitted for publication
Peer Reviewed:not peer reviewed
Sponsor:Illinois Department of Transportation IHR-25
Rights Information:No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161
Date Available in IDEALS:2013-11-21

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