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Title: Rectangular Concrete Sections Under Torsion

Author(s): Paul Andersen

Publication: Journal Proceedings

Volume: 34

Issue: 9

Appears on pages(s): 1-12

Keywords: none

DOI: 10.14359/8437

Date: 9/1/1937

Most concrete members in bridges and buildings sustaining torsion are of rectangular section, the torsional strength of which is most efficiently raised by 45 deg spirals. This paper reports the data obtained by subjecting 24 rectangular concrete specimens to torsional moments of increasing magnitude until failure. These data form the basis for a study of stress distribution, and ultimate strength. modulus of elasticity in shear, Of importance to the designer is the conclusion that the ultimate strength of a spirally reinforced section can be approximated from the strength of the plain concrete section and the amount of reinforcement.