Accurate Evaluation of Time-Dependent Deflections of Prestressed Concrete Frames

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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

Volume: 43

Issue:

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

Date: 1/1/1974

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.