Aggregate Interlock Role in R.C. Thin‐Webbed Beams in Shear
Publication: Journal of Structural Engineering
Volume 113, Issue 1
Abstract
The aggregate interlock mechanism gives a substantial contribution to the shear resistance of reinforced or prestressed concrete thin‐webbed beams, which are characterized by mostly linear, closely spaced, thin diagonal cracks at the onset of shear failure. Under these circumstances, the aggregate interlock effects can be adequately described by resorting to one of the few available models for aggregate interlock, such as the so‐called rough crack model, which is adopted here. On the assumption that the beam behaves like a plane truss, with shear and confinement stresses along the diagonal cracks, it is possible to determine the aggregate interlock contribution to the shear resistance and the necessary degree of shear reinforcement by solving a system of equations regarding the equilibrium of the truss, the stirrup‐to‐concrete compatibility, and the constitutive laws of the aggregate interlock, the solid concrete between the shear cracks, and the crack spacing. Results are obtained for different stirrup diameters and concrete strengths. Comparisons are made with CEB and ACI code provisions.
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References
1.
ASCE‐ACI Task Committee 426, “The Shear Strength of Reinforced Concrete Members,” Journal of the Structural Division, ASCE, Vol. 99, No. 6, 9791, June 1973, pp. 1091–1187.
2.
Bachmann, H., and Thürlimann, B., “Schubbemessung von Balken und Platten aus Stahlbeton, Stahlbeton mit Spannzulagen and Spannbeton,” Schweizerische Bauzeitung, Vol. 84, No. 33, July 1966, pp. 583–591,
and No. 34, Aug., 1966, pp. 599–606.
3.
Bažant, Z. P., and Gambarova, P. G., “Rough Cracks in Reinforced Concrete,” Journal of the Structural Division, ASCE, Vol. 106, No. 4, Apr. 1980, pp. 819–842.
4.
Collins, M. P., and Mitchell, D., “Shear and Torsion‐Design of Prestressed and Non‐Prestressed Concrete Beams,” PCI Journal, Sept.–Oct. 1980, pp. 32–100.
5.
Fenwick, R. C., and Paulay, T., “Mechanisms of Shear Resistance of Concrete Beams,” Journal of the Structural Division, ASCE, Vol. 94, No. 10, Oct. 1968, pp. 2325–2350.
6.
Gambarova, P. G., “On Aggregate Interlock Mechanism in Reinforced Concrete Plates with Extensive Cracking,” Transactions, IABSE Colloquium Delft 1981 on “Advanced Mechanics of Reinforced Concrete,” Delft University of Technology, Delft, June 1981, pp. 99–120.
7.
Gambarova, P. G., and Karakoç, C., “A New Approach to the Analysis of the Confinement Role in Regularly Cracked Concrete Elements,” Transactions, 7th SMiRT Conference, Vol. H, Paper H5/7, Chicago, Aug., 1983, pp. 251–261.
8.
Iori, I., and Dei Poli, S., “On the Behavior of Reinforced Concrete and Prestressed Concrete Elements Subjected to Torsion,” L'Industria Italiana del Cemento, No. 2, Feb., 1985, pp. 121–129 (in Italian).
9.
Kupfer, H., Mang, R., and Karavesyroglou, M., “Bruchzustand der Schubzone von Stahlbeton—und Spannbetonträgern—Eine Analyse unter Berucksichtigung der Rissverzahnung,” Bauingenieur 58, 1983, pp. 143–149.
10.
Leonhardt, F., “Shear and Torsion in Prestressed Concrete,” Proceedings, Sixth Congress of the Fédération Internationale de la Précontrainte, Prague, Czechoslovakia, 1970, pp. 137–155.
11.
Leonhardt, F., Koch, R., and Rostasy, F. S., “Schubversuche an Spannbetontragern,” Deutscher Ausschuss für Stahlbeton, Heft 227, Berlin, Federal Republic of Germany, 1973.
12.
Nielsen, M. P., Braestrup, M. W., and Bach, F., “Rational Analysis of Shear in Reinforced Concrete Beams,” IABSE Proceedings P15/7S, 1978.
13.
Pinto, P. E., and Calzona, R., “Experimental Investigation on the Shear Behavior of Prestressed, Post‐Tensioned Beams,” Report No. 29, Istituto di Scienza e Tecnica delle Costruzioni, Facoltà di Architettura, Università degli Studi di Roma, Rome, Italy, 1971 (in Italian).
14.
Robinson, J. R., and Demorieux, J. M., “Essais de poutres en double té en béton armé,” Annates de l'Institut Technique du Batiment et des Travaux Publics, No. 335, Jan., 1976, Serie: Beton, N. 153.
15.
Walraven, J. C., and Reinhardt, H. W., “Theory and Experiments on the Mechanical Behaviour of Cracks in Plain and Reinforced Concrete Subjected to Shear Loading,” Concrete Mechanics—Part A, Heron, Vol. 26, No. 1A, 1981.
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Published In
Journal of Structural Engineering
Volume 113 • Issue 1 • January 1987
Pages: 1 - 19
Copyright
Copyright © 1987 ASCE.
History
Published online: Jan 1, 1987
Published in print: Jan 1987
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