Concrete L-Beams Subject to Combined Torsional Loads

by D. Wayne Kirk, Assoc. Prof.; Dept. of Civ. Engrg., Royal Military Coll. of Canada, Kingston, Ontario, Canada,
David G. McIntosh, Formerly, Asst. Prof., Dept. of Civ. Engrg., Kingston, Ontario, Canada,

Serial Information: Journal of the Structural Division, 1975, Vol. 101, Issue 1, Pg. 269-282

Document Type: Journal Paper


The experimental results for 40 reinforced concrete L-beam sections subject to combined bending, torsion, and shear are presented. Theoretical methods are derived to predict the cracking and ultimate capacities of reinforced concrete L-beams containing symmetrically and unsymmetrically placed longitudinal steel with stirrups and subject to combined loading. The principal tensile stress criterion with the assumptions of plastic behavior for torsion and elastic behavior for flexure and transverse shear may be used to predict the cracking torque of a section. The provisions of the ACI Building Code and the National Building Code of Canada are conservative for predicting the ultimate capacity of L-beams and require numerous repetitive calculations to analyze a given section.

Subject Headings: Reinforced concrete | Concrete | Beams | Torsion | Load factors | Cracking | Structural behavior | Building codes | Canada

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