Time-Dependent Behavior of Noncomposite and Composite Post-Tensioned Concrete Girder Bridges

Fadl, Abdullahi Ibrahim; Gamble, W.L.

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https://hdl.handle.net/2142/13845 Copy

Description

Title

Time-Dependent Behavior of Noncomposite and Composite Post-Tensioned Concrete Girder Bridges

Author(s)

• Fadl, Abdullahi Ibrahim
• Gamble, W.L.

Issue Date

1976-10

Keyword(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.

Publisher

University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.

Series/Report Name or Number

Civil Engineering Studies SRS-430

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/13845

Sponsor(s)/Grant Number(s)

State of Illinois Department of Transportation

Owning Collections