Time-Dependent Section Analysis of Prestressed Concrete Beams

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Title: Time-Dependent Section Analysis of Prestressed Concrete Beams

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Publication: CIA

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Date: 2/13/2011

Abstract:
This paper presents a method to determine the time-dependent deflections in post-tensioned concrete beams. At this preliminary stage of the investigation an analytical model is presented to describe the time-dependent stress, strain and curvature at a prestressed concrete beam section considering concrete shrinkage and creep. Computation of prestress loss and the stress distribution in concrete, prestressed and non-prestressed steel due to time-dependent effects of creep and shrinkage is presented. The analysis is divided into several stages according to the load history and time. A Flow chart is included for implementing the method by a computer program. A numerical example is presented to illustrate the proposed method and a limited investigation into the effect of creep, shrinkage and load history on predicted curvatures.


Concrete Institute of Australia, International Partner Access.

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