Seismic Response and CFRP Retrofit of Poorly Detailed Shear Walls
Publication: Journal of Composites for Construction
Volume 16, Issue 3
Abstract
The reversed cyclic loading behavior of full-scale shear wall specimens was investigated before and after retrofit. The wall specimens were designed and detailed to simulate nonductile reinforced concrete construction of the 1960s, having lap splices of the longitudinal reinforcement in the potential plastic hinge region, and having inadequate confinement of the boundary regions. The lap splices in these walls failed in a brittle manner before yielding occurred in the main flexural reinforcement. The use and effectiveness of carbon fiber-reinforced polymer (CFRP) wrap for improving the lap splice behavior and the shear strength of the walls were investigated. The walls were tested under reversed cyclic loading with loading applied near the tip of the walls. The retrofit technique improved the displacement ductility, energy dissipation, and prevented premature failure of the lap splices. The target ductility level of 2.0 was achieved with this CFRP retrofit.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the Canadian Seismic Research Network (CSRN), funded by the Natural Sciences and Engineering Research Council of Canada (NSERC).
References
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-08, Farmington Hills, MI.
American Concrete Institute (ACI). (2003). “Bond and development of straight reinforcing bars in tension.” ACI 408R-03, Farmington Hills, MI.
American Concrete Institute (ACI). (2011). “Building code requirements for structural concrete and commentary.” ACI 318-11, Farmington Hills, MI.
Applied Technology Council (ATC). (1996). “Seismic evaluation and retrofit of concrete buildings.” ATC-40 Rep., Redwood City, CA.
Aycardi, L. E., Mander, J. B., and Reinhorn, A. M. (1994). “Seismic resistance of reinforced concrete frame structures designed only for gravity loads: Experimental performance of subassemblages.” ACI Struct. J.ASTJEG, 91(5), 552–563.
Balaguru, P., Nanni, A., and Giancaspro, J. (2009). FRP composites for reinforced and prestressed concrete structures, Taylor and Francis, New York.
Canadian Standard Association (CSA). (2004). “Design of concrete structures.” CAN/CSA-A23.3-04 (R2010), Mississauga, ON, Canada.
ElGawady, M., Endeshaw, M., McLean, D., and Sack, R. (2010). “Retrofitting of rectangular columns with deficient lap splices.” J. Compos. Constr.JCCOF2, 14(1), 22–35.
Ghobarah, A. (2000). “Seismic assessment of existing RC structures.” Prog Struct Mater, 2(1), 60–71.
Ghosh, K. K., and Sheikh, S. A. (2007). “Seismic upgrade with carbon fiber-reinforced polymer of columns containing lap-spliced reinforcing bars.” ACI Struct. J.ASTJEG, 104(2), 227–236.
Harries, K., Ricles, J., Pissiki, S., and Sause, R. (2006). “Seismic retrofit of lap-splices in nonductile square columns using CFRP jackets.” ACI Struct. J.ASTJEG, 103(6), 226–236.
Hawkins, N. M., Gamble, W. L., Shkurti, F. J., and Lin, Y. (2000). “Seismic strengthening of inadequate length lap splices.” Proc., 12th World Conf. Earthquake Eng., New Zealand Society for Earthquake Engineering, Upper Hutt, New Zealand.
Khalil, A., and Ghobarah, A. (2005). “Behaviour of rehabilitated structural walls.” J. Earthquake Eng., 9(3), 371–391.
Nanni, A. (1997). “Carbon FRP strengthening: New technology becomes mainstream.” Concr. Int.CNCIEH, 19(6), 19–23.
Park, R. (1988). “Ductility evaluation from laboratory and analytical testing.” Proc. 9th World Conf. Earthquake Eng., Japan Association for Earthquake Disaster Prevention, Tokyo-Kyoto, Japan, VIII, 605–616.
Paterson, J., and Mitchell, D. (2003). “Seismic retrofit of shear walls with headed bars and carbon fiber wrap.” J. Struct. Eng.JSENDH, 129(5), 606–614.
Paulay, T., and Priestley, M. J. N. (1992). Seismic design of reinforced concrete and masonry buildings, Wiley, New York.
Priestley, M., and Seible, F. (1995). “Design of seismic retrofit measures for concrete and masonry structures.” Constr. Build. Mater., 9(6), 365–377.
Priestley, M. J. N., Seible, F., and Calvi, G. M. (1996). Seismic design and retrofit of bridges, Wiley, New York.
Taghdi, M., Bruneau, M., and Saatcioglu, M. (2000). “Seismic retrofitting of low-rise masonry and concrete walls using steel strips.” J. Struct. Eng.JSENDH, 126(9), 1017–1025.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 16 • Issue 3 • June 2012
Pages: 332 - 339
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Jun 1, 2011
Accepted: Oct 7, 2011
Published online: May 15, 2012
Published in print: Jun 1, 2012
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