Confinement Steel Requirements for Connections in Ductile Frames
Publication: Journal of Structural Engineering
Volume 116, Issue 3
Abstract
Results of tests on a large number of beam‐column subassemblies performed by the writers and others are examined. After reviewing the existing techniques, an index is proposed that can quantify the energy absorption and dissipation characteristics of a reinforced concrete frame. Based on this index, a simple design chart is presented for selection of the required area of confining steel for the joint region of R.C. frames so that ductile behavior can be achieved. The confining steel is a function of the joint shear stress and the ratio of the flexural capacities of the columns to that of the beam at the joint. The numerical examples included demonstrate that for the extreme case, the required area of steel obtained from the design chart is comparable to the current ACI‐ASCE Committee 352 recommendations. However, for many other cases, the design chart permits a relaxation of the area of confining steel required. This results in greater ease and economy of construction.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
ACI‐ASCE Committee 352. (1976). “Recommendations for design of beam‐column joints in monolithic reinforced concrete structures.” ACI J., 73(7), 375–393.
2.
ACI‐ASCE Committee 352. (1985). “Recommendations for design of beam‐column joints in monolithic reinforced concrete structures.” ACI J., 82(3), 266–283.
3.
ACI Committee 318. (1983). “Building code requirements for reinforced concrete.” ACI 318‐83, Amer. Concr. Inst., Detroit, Mich.
4.
Ehsani, M. R., and Wight, J. K. (1985a). “Effects of transverse beams and slab on behavior of reinforced concrete beam‐to‐column connections.” ACI J., 82(2), 188–195.
5.
Ehsani, M. R., and Wight, J. K. (1985b). “Exterior reinforced concrete beam‐to‐column connections subjected to earthquake type loading.” ACI J., 82(3), 492–499.
6.
Gosain, N. K., Brown, R. H., and Jirsa, J. O. (1977). “Shear requirements for load reversals on R/C members.” J. Struct. Div., ASCE, 103(7), 1461–1476.
7.
Hiraishi, H., et al. (1985). “Static tests on shear walls and beam‐column assemblies and study on correlation between shaking table tests and pseudo‐dynamic tests.” ACI SP‐84: Earthquake Effects on Reinforced Concrete Structures, Am. Concr. Inst., Detroit, Mich., 11–48.
8.
Hwang, T. H., and Scribner, C. F. (1984). “R/C member cyclic response during various loadings.” J. Struct. Div., ASCE, 110(3), 477–487.
9.
Lee, D. L. N., Wight, J. K., and Hanson, R. D. (1977). “R/C beam‐column joints under large load reversals.” J. Struct. Div., ASCE, 103(12), 2337–2350.
10.
Nmai, C. K., and Darwin, D. (1984). “Cyclic behavior of lightly reinforced concrete beams.” SM Report No. 12, Struct. Engrg. and Engrg. Matls., Univ. of Kansas, Lawrence, Kans.
11.
Renton, G. W. (1972). “The behavior of reinforced concrete beam‐column joints under seismic loading.” Thesis presented to the University of Canterbury, at Canterbury, New Zealand, in partial fulfillment of the requirements for the degree of Master of Engineering.
12.
Scarpas, A. (1981). “The inelastic behavior of earthquake reinforced concrete exterior beam‐column joints.” Report No. 81‐2, Dept. of Civ. Engrg., Univ. of Canterbury, Canterbury, New Zealand.
13.
Scribner, C. F., and Wight, J. K. (1980). “Strength decay in R/C beams under load reversals.” J. Struct. Div., ASCE, 106(4), 861–876.
14.
Uzumeri, S. M. (1977). “Strength and ductility of cast‐in‐place beam‐column joints.” Reinforced Concrete Structures in Seismic Zones, SP‐53, Amer. Concr. Inst., Detroit, Mich., 293–350.
15.
Yacoub, M. (1986). “Performance criteria for reinforced concrete beam‐column connections.” Thesis submitted to the University of Arizona, at Tucson, Ariz., in partial fulfillment of the requirements for the degree of Master of Science.
16.
Zerbe, H. E., and Durrani, A. J. (1985). “Effect of a slab on the behavior of exterior beam to column connections.” Report No. 30, Rice Univ., Houston, Tex.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 116 • Issue 3 • March 1990
Pages: 751 - 767
Copyright
Copyright © 1990 ASCE.
History
Published online: Mar 1, 1990
Published in print: Mar 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.