Displacements and Losses in Multistage Prestressed Members

by Amin Ghali, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Calgary, Calgary, AB, Canada,
Romy G. Sisodiya, Visiting Asst. Prof.; Dept. of Civ. Engrg., McGill Univ., Montreal, PQ, Canada,
Gamil S. Tadros, Res. Assoc.; Dept. of Civ. Engrg., Univ. of Calgary, Calgary, AB,

Serial Information: Journal of the Structural Division, 1974, Vol. 100, Issue 11, Pg. 2307-2322

Document Type: Journal Paper


This paper presents a numerical procedure to calculate the loss of prestress, the strain at centroid, and the curvature in concrete beams prestressed in a number of stages. The loss calculated is caused by instantaneous deformations, relaxation of steel, shrinkage, and creep of concrete. Account is made of the elastic and creep recoveries of concrete and the effect of variation of stress level on the relaxation of steel. Included is an application to find the losses and deflections of a prestressed concrete bridge built by the cantilever method (consecutive segments cast and prestressed in multistages).

Subject Headings: Prestressing | Concrete bridges | Concrete beams | Displacement (mechanics) | Prestressed concrete | Relaxation (mechanics) | Steel | Creep

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