Strength of Prestressed Concrete I-Beams in Combined Torsion and Bending

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Title: Strength of Prestressed Concrete I-Beams in Combined Torsion and Bending

Author(s): B. Vijaya Rangan and A. S. Hall

Publication: Journal Proceedings

Volume: 75

Issue: 11

Appears on pages(s): 612-618

Keywords: beams 9supports);bending;bend tests;flanges;I-beams;prestressed concrete; prestressing steels;shear properties;shear tests;torsion;torsion tests.

Date: 11/1/1978

Abstract:
Tests on 22 prestressed concrete I-beams are reported. Most beams were tested in bending and torsion, but four also carried shear. Seven beams had einforcement linking the flanges to the webs; and fifteen had no such reinforcement. Strength theories are developed for both types of beams. It is concluded that flange reinfocement in I-beams is essential since without it the flanges add little to the strength of the web alone, and may even be detrimental. Building codes rules should perhaps take account of this.