Torsion in Concrete Beams Containing an Opening

by Hans R. Daniel, Struct. Engr.; Dywidag Canada Ltd., Calgary, Canada,
Arthur E. McMullen, (M.ASCE), Prof. of Civ. Engrg.; Dept. of Civ. Engrg., The Univ. of Calgary, Calgary, Canada,

Serial Information: Journal of the Structural Division, 1977, Vol. 103, Issue 3, Pg. 607-617

Document Type: Journal Paper


An analysis is presented for predicting the strength of reinforced concrete beams that are subjected to torsion and have openings cast in them in order to provide for the passage of service ducts. The equations proposed are based on addition of stresses due to torsion and flexure in the longitudinal reinforcement and the addition of stresses due to torsion and transverse shear in the stirrups. Test results of 14 beams with openings are also presented. Correlation between the test results and the strength predicted by the analysis indicates that the equations conservatively but adequately predict the strength of the beams.

Subject Headings: Concrete beams | Structural strength | Torsion | Strength of materials | Reinforced concrete | Duct | Shear stress | Transverse shear

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