Flexural Strength of Prestressed Concrete Beams


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Title: Flexural Strength of Prestressed Concrete Beams

Author(s): D. F. Billet and J. H. Appleton

Publication: Journal Proceedings

Volume: 50

Issue: 6

Appears on pages(s): 837-854

Keywords: no keywords

Date: 6/1/1954

Analytical and experimental studies on behavior and ultimate flexursl strength of post-tensioned, end-anchored, bonded, prestressed concrete beams are reported. A rational analysts is. developed for computing ultimate moment and steel stress at failure. Approximate expressions are given for computing ultimate steel stress for cases when the stress-strain curve for the steel reinforcement may be approximat.ed by two straight lines. Results of tests on 26 rectangular prestressed concrete beams are presented. The effect of major variables-percentage of steel, amount of prestress, and concrete strength-on deflections, cracking loads, and ultimate loads are studied. Twenty-one beams failed in flexure, either by crushing of concrete after excessive elongation of reinforcement or by crushing of concrete while steel stress was in the elastic range. Three beams were nearly balanced between shear and flexural failure, and two beams failed initially in bond. Comparisons of actual ultimate moments with those computed by analytical expressions show good agreement.