Torsion Design Charts for Reinforced Concrete Rectangular Members
Publication: Journal of Structural Engineering
Volume 126, Issue 2
Abstract
This paper presents design charts constructed from the softened truss model to facilitate the torsional design of reinforced concrete rectangular members. These design charts comprise a normalized failure mode diagram and a strength contour diagram. Given a reinforced concrete rectangular section, the former diagram can be used to determine the corresponding failure mode and the latter one the strength. These diagrams are plotted on the plane of two newly defined reinforcement indices including the longitudinal and transverse steel indices, which are introduced so that the design charts are independent of the section dimensions, the yield strength of reinforcement, and the compressive strength of concrete. The accuracy of the proposed design charts in the prediction of the failure mode and the torsional strength is comparable to that of the softened truss model, as demonstrated in the presented example, whereas the design charts are more computation efficient for use by designers than the softened truss model.
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References
1.
“Building code requirements for structural concrete and commentary.” (1995). ACI 318-95 and ACI 318R-95, American Concrete Institute, Detroit.
2.
CEB-FIP model code 1990. (1990). Thomas Telford, London.
3.
Collins, M. P., and Mitchell, D. (1991). Prestressed concrete structures. Prentice-Hall, Englewood Cliffs, N.J.
4.
Hsu, T. T. C. (1968). “Torsion of structural concrete—behavior of reinforced concrete rectangular members.” Proc., Torsion of Struct. Concrete, American Concrete Institute, Detroit, 261–306.
5.
Hsu, T. T. C. (1988). “Softened truss model theory for shear and torsion.” ACI Struct. J., 85(6), 624–635.
6.
Hsu, T. T. C. (1993). Unified theory of reinforced concrete. CRC, Boca Raton, Fla.
7.
Lee, Y.-S. ( 1998). “Theoretical analysis of FRP strengthened reinforced concrete beams,” Master thesis, Dept. of Civ. Engrg., National Taiwan University, Taipei, Taiwan (in Chinese).
8.
Rahal, K. N., and Collins, M. P. (1996). “Simple model for predicting torsional strength of reinforced and prestressed concrete sections.” ACI Struct. J., 93(6), 658–666.
9.
Vecchio, F. J., and Collins, M. P. (1986). “Predicting the response of reinforced concrete beams subjected to shear using modified compression filed theory.” ACI Struct. J., 85(2), 258–268.
10.
Wang, W., and Hsu, C. T. T. (1997). “Limit analysis of reinforced concrete beams subjected to pure torsion.”J. Struct. Engrg., ASCE, 123(1), 86–94.
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Received: Jan 21, 1999
Published online: Feb 1, 2000
Published in print: Feb 2000
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