Torsion Tests on Reinforced Concrete Slab Elements
Publication: Journal of Structural Engineering
Volume 113, Issue 5
Abstract
Results of torsion tests to failure on nine orthogonally reinforced concrete slab elements are described and compared with various theoretical predictions. The specimens had dimensions of Geometrical reinforcement ratios ranged from 0.25–1.0%. Post‐cracking behavior of the specimens, was accurately predicted by nonlinear analyses that take the softening of the concrete response in compression due to transverse tensile straining into account. Cracked linear response analyses provided very good approximations. Ultimate resistances were between 5–46% below yield‐line theory predictions. However, they were closely predicted by a lower‐bound limit analysis approach with an assumed effective concrete compressive strength equal to 45% of the measured uniaxial compressive strength. Observed peak moments exceeded ultimate resistance predictions based on the torsion design provisions of the current American building code requirements for reinforced concrete by 8%–117%. Except for one specimen that failed at a load 9% less than predicted, Canadian code predictions of the ultimate resistances were exceeded by 3–41%.
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References
1.
ACI 318‐83: Building code requirements for reinforced concrete. (1983). American Concrete Institute, Detroit, Mich.
2.
CAN3‐A23.3‐M84: Design of concrete structures for buildings. (1984). Canadian Standards Association, Rexdale, Ontario, Canada.
3.
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Khalifa, W. U. (1985). “Investigating the response of reinforced concrete slab elements in pure torsion,” thesis presented to the University of Toronto, at Toronto, Ontario, Canada, in partial fulfillment of the requirements for the degree of Master of Applied Science.
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Leesti, P. (1985). “Reinforced concrete slab elements in pure torsion,” thesis presented to the University of Toronto, at Toronto, Ontario, Canada, in partial fulfillment of the requirements for the degree of Master of Applied Science.
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Marti, P. (1982). “Strength and deformations of reinforced concrete members under torsion and combined actions,” Bulletin d'lnformation No. 146, Comité Euro‐International du Béton, Paris, France, pp. 97–138.
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Marti, P., and Kong, K. (1987). “Response of reinforced concrete slab elements to torsion,” J. Struct. Engrg., ASCE, 113(5), 976–993.
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Copyright © 1987 ASCE.
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Published online: May 1, 1987
Published in print: May 1987
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