Performance-Based Seismic Retrofit Strategy for Existing Reinforced Concrete Frame Systems Using Fiber-Reinforced Polymer Composites
Publication: Journal of Composites for Construction
Volume 11, Issue 2
Abstract
The feasibility and efficiency of a seismic retrofit intervention using externally bonded fiber-reinforced polymer composites on existing reinforced concrete frame systems, designed prior to the introduction of modern standard seismic design code provisions in the mid-1970s, are herein presented, based on analytical and experimental investigations on beam-column joint subassemblies and frame systems. A multilevel retrofit strategy, following hierarchy of strength considerations, is adopted to achieve the desired performance. The expected sequence of events is visualized through capacity-demand curves within performance domains. An analytical procedure able to predict the enhanced nonlinear behavior of the panel zone region, due to the application of CFRP laminates, in terms of shear strength (principal stresses) versus shear deformation, has been developed and is herein proposed as a fundamental step for the definition of a proper retrofit solution. The experimental results from quasi-static tests on beam-column subassemblies, either interior and exterior, and on three-storey three-bay frame systems in their as-built and CFRP retrofitted configurations, provided very satisfactory confirmation of the viability and reliability of the adopted retrofit solution as well as of the proposed analytical procedure to predict the actual sequence of events.
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Acknowledgments
The financial support provided by the Italian Ministry of the University and the University of Pavia, under a coordinated national project (PRIN 2001), as well as by the European Community (Contract No. SPEAR G6RD-CT-2001-00525) is gratefully acknowledged. The writers wish to thank the MAC S.p.a. Treviso for providing the materials and technical assistance for the retrofit intervention. The assistance and cooperation, during different phases of the project, of postgraduate students Mr. A. Vecchietti and Mr. R. Nassi are also gratefully acknowledged.
References
Antonopoulos, C. P., and Triantafillou, T. C. (2002). “Analysis of FRP-strengthened RC beam-column joints.” J. Compos. Constr. 6(1), 41–51.
Antonopoulos, C. P., and Triantafillou, T. C. (2003). “Experimental investigation on FRP-strengthened RC beam-column joints.” J. Compos. Constr. 7(1), 39–43.
Aycardi, L. E., Mander, J. B., and Reinhorn, A. M. (1994). “Seismic resistance of R. C. frame structures designed only for gravity loads: Experimental performance of subassemblages.” ACI Struct. J. 91(5), 552–563.
Beres, A., Pessiki, S., White, R., and Gergely, P. (1996). “Implications of experimental on the seismic behaviour of gravity load designed RC beam-column connections.” Earthquake Spectra 12(2), 185–198.
Bing, L., Yiming, W., and Tso-Chien, P. (2002). “Seismic behavior of non-seismically detailed interior beam-wide column joints. Part I: Experimental results and observed behavior.” ACI Struct. J. 99(6), 791–802.
Calvi, G. M., Magenes, G., and Pampanin, S. (2002a). “Relevance of beam-column damage and collapse in RC frame assessment.” J. Earthquake Eng. 6(1), 75–100
Calvi, G. M., Magenes, G., and Pampanin, S. (2002b). “Experimental test on a three storey R. C. frame designed for gravity only.” 12th ECEE, London, Paper No. 727.
Dodd, L. L., and Restrepo, J. I. (1995). “Model for predicting cyclic behavior of reinforcing steel.” J. Struct. Eng. 121(3), 433–445.
Dolce, M., Cardone, D., and Marnetto, R. (2000). “Implementation and testing of passive control devices based on shape memory alloys.” Earthquake Eng. Struct. Dyn. 29(7), 945–968.
Federation International du Beton (FIB). (2001). “Externally bonded FRP reinforcement for RC structures.” FIB Bulletin No. 14, Lausanne.
Federation International du Beton (FIB). (2006). “Retrofitting of concrete structures by externally bonded FRPs with emphasis on seismic applications.” FIB Bulletin No. 35, Lausanne.
Gergely, J., 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.
Hakuto, S., Park, R., and Tanaka, H. (2000). “Seismic load tests on interior and exterior beam-column joints with substandard reinforcing details.” ACI Struct. J. 97(1), 11–25.
Hertanto, E. (2006). “Seismic assessment of pre-1970s reinforced concrete beam column joint subassemblies” ME dissertation, Dept. of Civil Engineering, Univ. of Canterbury, Christchurch, New Zealand.
Holzenkämpfer, P. (1994). “Ingenieurmodelle des verbundes geklebter bewehrung für betonbauteile.” Ph.D. dissertation, TU Braunshwieg (in German).
Mander, J. B., Priestley, M. J. N., and Park, R. (1988). “Theoretical stress-strain model for confined concrete.” J. Struct. Eng. 114(8), 1804–1826.
Nassi, R. (2002). “Seismic retrofit strategy for underdesigned beam-column subassemblies using FRP.” Laurea thesis, Dept. of Structural Mechanics, Univ. of Pavia (in Italian).
Neubauer, U., and Rostásy, F. S. (1997). “Design aspects of concrete structures strengthened with externally bonded CFRP-plates, concrete+composites.” 7th Int. Conf. Structural Faults and Repair, Vol. 2, 109–118.
Pampanin, S., Calvi, G. M., and Moratti, M. (2002). “Seismic behaviour of R. C. beam-column joints designed for gravity loads.” 12th ECEE, London, Paper No. 726.
Pampanin, S., and Christopoulos, C. (2003). “Non-invasive retrofit of existing RC frames designed for gravity loads only.” FIB2003 Symp. Concrete Structures in Seismic Regions, Federation International du Beton, Athens.
Pampanin, S., Magenes, G., and Carr, A. (2003). “Modelling of shear hinge mechanism in poorly detailed RC beam-column joints.” Proc. FIB Symp. Concrete Structures in Seismic Regions, Federation International du Beton, Athens, Paper No. 171.
Pampanin, S., Christopoulos, C., and Chen, T-H. (2006). “Development and validation of a haunch metallic seismic retrofit solution for existing under-designed RC frame buildings.” Earthquake Eng. Struct. Dyn. 35(14), 1739–1766.
Pantazopoulou, S. J., and Bonacci, J. F. (1994). “On earthquake-resistance reinforced concrete frame connections.” Can. J. Civ. Eng. 21, 307–328.
Pantelides, C. P., Clyde, C., and Reaveley, L. D. (2000). “Rehabilitation of R/C building joints with FRP composites.” 12WCEE Auckland, Paper No. 2306.
Park, R. (2002). “A summary of results of simulated seismic load tests on reinforced concrete beam-column joints, beams and columns with substandard reinforcing details.” J. Earthquake Eng. 6(2), 1–27.
Priestley, M. J. N. (1997). “Displacement-based seismic assessment of reinforced concrete buildings.” J. Earthquake Eng. 1(1), 157–192.
Prota, A., Manfredi, G., Nanni, A., and Cosenza, E. (2002). “Capacity assessment of GLD RC frames strengthened with FR.” 12th European Conf. on Earthquake Engineering, London, Paper No. 241.
Regio Decreto. (1939). 16 November-XVIII, n. 2228 (in Italian).
Santarella, L. (1957). Il cemento armato, Vol. 2, Ed. U. Hoepli, Milan.
Spoelstra, M. R., and Monti, G. (1999). “FRP-confined concrete model.” J. Compos. Constr. 3(3), 143–150.
Sugano, S. (1996) “State of the art in techniques for rehabilitation of buildings.” Proc., 11th World Conf. on Earthquake Engineering, Acapulco, Mexico, Paper No. 2175.
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, 1, 455–466 (in Greek).
Vecchietti, A. (2001). “Seismic rehabilitation of concrete frame systems designed for gravity loads only using FRP composite materials.” Laurea thesis, Dept. of Structural Mechanics, Univ. of Pavia (in Italian).
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 11 • Issue 2 • April 2007
Pages: 211 - 226
Copyright
© 2007 ASCE.
History
Received: Sep 21, 2005
Accepted: Feb 6, 2006
Published online: Apr 1, 2007
Published in print: Apr 2007
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