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Structural Research Series 430PDF

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Title:Time-Dependent Behavior of Noncomposite and Composite Post-Tensioned Concrete Girder Bridges
Author(s):Fadl, Abdullahi Ibrahim; Gamble, W.L.
Subject(s):Post-tensioned concrete
Concrete -- Creep
Steel -- Relaxation
Abstract:A method for the analysis of time-dependent deformations in a continuous posttensioned concrete girder is presented. The creep and shrinkage properties of the concrete and the relaxation of the steel can be varied, as can friction between strands and ducts. Recommendations are made for estimating long-term prestress losses for structures post-tensioned with either stress-relieved or low-relaxation strands. Large changes in stress distributions were found to occur at cross sections, and substantial changes in the moment distribution can occur, especially in composite structures. These changes may occur even when there is only a small change in the steel force, and consequently the changes in concrete stress with time may not be closely related to the changes in steel stress.
Issue Date:1976-10
Publisher:University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Civil Engineering Studies SRS-430
Genre:Technical Report
Type:Text
Language:English
URI:http://hdl.handle.net/2142/13845
Sponsor:State of Illinois Department of Transportation
Date Available in IDEALS:2009-09-29
Identifier in Online Catalog:3587603
2686597
208635


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