Ultimate Flexural Strength of Prestressed and Conventionally Reinforced Concrete Beams

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Title: Ultimate Flexural Strength of Prestressed and Conventionally Reinforced Concrete Beams

Author(s): Jack R. Janney, Eivind Hognestad, and Douglas McHenry

Publication: Journal Proceedings

Volume: 52

Issue: 2

Appears on pages(s): 601-620

Keywords: no keywords

Date: 2/1/1956

Abstract:
Based on experimental and analytical studies of flexural behavior and ultimate strength of beams, the relative performances of various types of prestressed and conventional reinforcement are compared. Test results of 19 rectangular beams are given, involving (1) three pre-tensioned, (2) three post-tensioned grouted, (3) five post-tensioned unbonded, (4) three post-tensioned unbonded with deformed bars added, and (5) five with conventional deformed bar reinforcement. For three reinforcement percentages, the characteristics of these five types of reinforcement are compared in terms of moment-deflection relationships, deflection recovery, and ultimate strength of beams failing in flexure. An ultimate strength analysis permitted prediction of measured ultimate moments for all beams with satisfactory accuracy.