Ductility Analysis of Confined Columns
Publication: Journal of Structural Engineering
Volume 116, Issue 11
Abstract
This paper describes in detail the weakness of the procedure in the American Concrete Institute (ACI) Building Code used for detailing columns for ductility. It also presents an approach for calculating the amount of transverse steel required in confined columns at various load levels by using idealized stress‐strain diagrams for confined concrete and steel, moment‐curvature curves, and a suggested ductility requirement in which the criterion is specified as the attainment of a curvature factor of 12 at a moment capacity of not less than 75% of the maximum moment capacity. The new approach is more realistic than that of the ACI code, which assumes the function of the transverse reinforcement is to compensate for the loss of the cover concrete. This is particularly important in columns acted upon by a combination of axial load, bending, and shear forces. The controversy surrounding this issue is briefly discussed.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Baker, A. L., and Amarakone, A. M. N. (1965). “Inelastic hyperstatic frames analysis.” Flexural Mechanics of Reinforced Concrete, SP‐12, Amer. Concr. Inst./ASCE, Detroit, Mich., 85–142.
2.
Building code requirements for reinforced concrete (ACI 318‐83). (1983). Amer. Concr. Inst., Detroit, Mich.
3.
Cohn, M. Z., and Ghosh, S. K. (1972). “The flexural ductility of reinforced concrete sections.” IABSE, 32‐2 (53‐73), 53–73.
4.
Corley, W. G. (1966). “Rotational capacity of reinforced concrete beams.” J. Struct. Div., ASCE, 92(5), 121–146.
5.
Dilger, W. H., Koch, R., and Kowalczyk, R. (1984). “Ductility of plain and confined concrete under different strain rates.” ACI J., 81(1), 73–81.
6.
Fafitis, A., and Shah, S. P. (1985). “Predictions of ultimate behavior of confined columns subjected to large deformations.” ACI J., 82(4), 423–433.
7.
Iyengar, K. T., et al. (1970). “Stress‐strain characteristics of concrete confined in steel binders.” Concr. Res., 22(72), 173–184.
8.
Kent, D. C., and Park, R. (1971). “Flexural members with confined concrete.” J. Struct. Div., ASCE, 97(7), 1969–1990.
9.
Ozcebe, G., and Saatcioglu, M. (1987). “Confinement of concrete columns for seismic loading.” ACI Struct. J., 84(4), 308–315.
10.
Park, R., and Paulay, T. (1975). Reinforced concrete structures. John Wiley and Sons, New York, N.Y.
11.
Park, R., Priestly, M. J. N., and Gill, W. D. (1982). “Ductility of square‐confined concrete columns.” J. Struct. Engrg., ASCE, 108(4), 929–950.
12.
Priestly, M. J. N., and Park, R. (1987). “Strength and ductility of concrete bridge columns under seismic loading.” ACI Struct. J., 84(1), 61–76.
13.
Roy, H. E. H., and Sozen, M. A. (1965). “Ductility of concrete.” Flexural mechanics of reinforced concrete, SP‐12, Amer. Concr. Inst./ASCE, Detroit, Mich., 213–224.
14.
Sargin, M., Ghosh, S. K., and Handa, V. K. (1971). “Effects of lateral reinforcement upon the strength and deformation properties of concrete.” Concr. Res., 23(75–76), 99–118.
15.
Scott, B. D., Park, R., and Priestly, M. J. N. (1982). “Stress‐strain behavior of concrete confined by overlapping hoops at low and high strain rates.” ACI J., 79(1), 13–27.
16.
Sheikh, S. A., and Uzumeri, S. M. (1982). “Analytical model for concrete confinement in tied columns.” J. Struct. Engrg., ASCE, 108(12), 2703–2722.
17.
Sheikh, S. A., and Yeh, C. C. (1986). “Flexural behavior of confined concrete columns.” ACI J., 83(3), 389–404.
18.
Soliman, M. T. M., and Yu, C. W. (1967). “The flexural stress‐strain relationship of concrete by rectangular transverse reinforcement.” Concr. Res., 19(61), 223–238.
19.
Stockl, S. (1965). Discussion of “Ductility of Concrete” by H. E. H. Roy and M. A. Sozen, Flexural Mech. of Reinforced Concr., SP‐12, American Concr. Inst./ASCE, Detroit, Mich., 225–227.
20.
Szulczynski, T., and Sozen, M. A. (1963). “Load deformation characteristics of concrete prisms with rectilinear transverse reinforcement.” Civ. Engrg. Studies, Struct. Res. Series No. 268, Univ. of Illinois, Urbana, Ill.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 116 • Issue 11 • November 1990
Pages: 3148 - 3161
Copyright
Copyright © 1990 ASCE.
History
Published online: Nov 1, 1990
Published in print: Nov 1990
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.