Title: Accurate Evaluation of Time-Dependent Deflections of Prestressed Concrete Frames
Author(s): A. Ghali, M.K. Tadros, and W.H. Dilger
Publication: Symposium Paper
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
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.