Analysis of FRP-Strengthened RC Beam-Column Joints
Publication: Journal of Composites for Construction
Volume 6, Issue 1
Abstract
Analytical models are presented in this study for the analysis of reinforced concrete joints strengthened with composite materials in the form of externally bonded reinforcement comprising unidirectional strips or flexible fabrics. The models provide equations for stresses and strains at various stages of the response (before or after yielding of the beam or column reinforcement) until the ultimate capacity is reached, defined by concrete crushing or fiber-reinforced polymer (FRP) failure due to fracture or debonding. Solutions to these equations are obtained numerically. The models provide useful information on the shear capacity of FRP-strengthened joints in terms of the quantity and configuration of the externally bonded reinforcement and may be used to design FRP patching for inadequately detailed beam-column joints. A number of case studies are examined in this article, indicating that even low quantities of FRP materials may provide significant enhancement of the shear capacity. The effectiveness of external reinforcement increases considerably if debonding is suppressed and depends heavily on the distribution of layers in the beam and column. The latter depends on the relative quantities of steel reinforcement crossing the joint panel and the level of axial load in the column. Analytical shear strength predictions were in good agreement with test results found in the literature, thus adding confidence to the validity of the proposed models.
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References
Alcocer, S., and Jirsa, J. O.(1993). “Strength of reinforced concrete frame connections rehabilitated by jacketing.” ACI Struct. J., 90(3), 249–261.
Antonopoulos, C. P., and Triantafillou, T. C. (2001). “Experimental investigation of FRP-strengthened RC beam-column joints.” J. Compos. Constr., accepted.
Beres, A., El-Borgi, S., White, R. N., and Gergely, P. (1992). “Experimental results of repaired and retrofitted beam-column joint tests in lightly reinforced concrete frame buildings.” Technical Report NCEER-92-0025, State Univ. of New York at Buffalo.
Gergely, I., Pantelides, C. P., Nuismer, R. J., and Reaveley, L. D.(1998). “Bridge pier retrofit using fiber-reinforced plastic composites.” J. Compos. Constr., 2(4), 165–174.
Gergely, J., Pantelides, C. P., and Reaveley, L. D.(2000). “Shear strengthening of RC T-joints using CFRP composites.” J. Compos. Constr., 4(2), 56–64.
Ghobarah, A., Aziz, T. S., and Biddah, A.(1997). “Rehabilitation of reinforced concrete frame connections using corrugated steel jacketing.” ACI Struct. J., 4(3), 283–294.
Holzenkämpfer, P. (1994). “Ingenieurmodelle des verbundes geklebter Bewehrung für Betonbauteile.” PhD dissertation, TU Braunschweig, Germany.
Jones, R. M. (1975). Mechanics of composite materials. Scripta Book Company, Washington, D.C.
Neubauer, U., and Rostásy, F. S. (1997). “Design aspects of concrete structures strengthened with externally bonded CFRP-plates.” Concrete+Composites, Proceedings of the 7th International Conference on Structural Faults and Repair, Vol. 2, 109–118.
Pantazopoulou, S., and Bonacci, J.(1992). “Consideration of questions about beam-column joints.” ACI Struct. J., 89(1), 27–36.
Pantelides, C. P., Gergely, I., Reaveley, L. D., and Nuismer, R. J. (1997). “Rehabilitation of cap beam-column joints with carbon fiber jackets.” Proc., 3rd Int. Symp. on Non-Metallic (FRP) Reinforcement for Concrete Structures, Japan Concrete Institute, Sapporo, Japan, Vol. 1, 587–595.
Pantelides, C. P., Gergely, J., Reaveley, L. D., and Volnyy, V.(1999). “Retrofit of RC bridge pier with CFRP advanced composites.” J. Struct. Eng., 125(10), 1094–1099.
Paulay, T., and Priestley, M. J. N. (1992). Seismic design of reinforced concrete and masonry buildings,” Wiley, New York.
Triantafillou, T. C., and Antonopoulos, C. P.(2000). “Design of concrete flexural members strengthened in shear with FRP.” J. Compos. Constr., 4(4), 198–205.
Tsonos, A. D., and Stylianidis, K. A. (1999). “Pre-seismic and post-seismic strengthening of reinforced concrete structural subassemblages using composite materials (FRP).” Proc., 13th Hellenic Concrete Conference, Rethymno, Greece, Vol. 1, 455–466 (in Greek).
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Information
Published In
Journal of Composites for Construction
Volume 6 • Issue 1 • February 2002
Pages: 41 - 51
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jan 9, 2000
Revised: Apr 9, 2001
Published online: Feb 1, 2002
Published in print: Feb 2002
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