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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: A Simple Method to Analyse Time-Dependent Forces Developed in Continuous Concrete Structures
Author(s): W. H. Dilger
Publication: Special Publication
Appears on pages(s): 325-340
Keywords: continuity (structural); creep properties; frames;
loads (forces); reinforced concrete;shrinkage; strains; stresses;
Abstract:In any concrete frame structure in which the support conditions are changed during or after construction, or in which shrinkage strains are developed, time-dependent forces occur. These forces may be substantial in structures in which continuity is provided at a later stage of construction, or when it is built in stages. A simple method is presented in which the elastic equations (Muller-Breslau) are expanded to include the time-dependent displacements due to (a) the constant statically determinate and in-determinate forces which are present at the beginning of the continuous action and (b) the time-varying forces introduced by creep and shrinkage. Use is made of the relaxation (aging) coefficient which allows to include in a simple way the effects of aging of the concrete in a structural member subjected to varying forces. A number of different practical examples are given to explain the procedure.
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