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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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: Accurate Evaluation of Time-Dependent Deflections of Prestressed Concrete Frames
Author(s): A. Ghali, M.K. Tadros, and W.H. Dilger
Publication: Special Publication
Appears on pages(s): 357-376
Keywords: age; axial loads; beams (supports); creep properties; creep recovery; deflection; deformation; frames; modulus of elasticity; prestress loss; prestressed concrete; shrinkage
Abstract:The problem of evaluation of displacement components (deflections or rotations) including the effects of creep and shrinkage of concrete and relaxation of steel is closely related to the problem of calculation of prestress losses. This paper presents an accurate design method using a chart for the caluclation of the prestress loss, the axial strain, and the curvature at any section of a prestressed concrete frame. . .The method presented in this paper can be used for any framed structure; its application to the case frequently met in practice of a simple beam is demonstrated.
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