Carbon Fiber Shear Retrofit of Forty-Two-Year-Old AASHTO -Shaped Girders
Publication: Journal of Composites for Construction
Volume 15, Issue 5
Abstract
Sixteen shear capacity tests were performed on eight decommissioned AASHTO prestressed concrete girders that had been in service for over 42 years. These bridge members presented a unique opportunity to investigate carbon fiber-reinforced polymer (CFRP) retrofit schemes to enhance the shear capacity of underreinforced girders that were nonrectangular. Four destructive tests were performed to quantify the in-service strength of the girders and the remaining 12 tests were performed on CFRP retrofitted girders. In all, five configurations of the CFRP reinforcement were evaluated. Two anchoring techniques were investigated that either involved epoxying a horizontal CFRP strip over the vertical strips or a new methodology of epoxying a CFRP laminate into a groove over the vertical strips that was cut at the web-to-flange interface. Two methodologies that predicted the shear contribution of the carbon fiber reinforcement were compared with the test results. A carbon fiber-reinforcing scheme of vertical strips and horizontal anchorage strip was found to be the most effective in resisting the applied shear.
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Acknowledgments
The authors wish to express their sincere gratitude to The Chemical Company (BASF) for donating the CFRP fabric as well as the Utah Department of Transportation for the funding.
References
AASHTO. (2009). AASHTO LRFD bridge design specifications, 4th Ed., Washington, DC.
American Concrete Institute (ACI). (2008a). “Building code requirements for structural concrete and commentary.” ACI 318-08, Farmington Hills, MI.
Adhikary, B. B., and Mutsuyoshi, H. (2004). “Behavior of concrete beams strengthened in shear with carbon-fiber sheets.” J. Compos. Constr., 8(3), 258–264.
American Concrete Institute (ACI). (2008b). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures and commentary.” ACI 440.2R-08, Farmington Hills, MI.
Cao, S. Y., Chen, J. F., Hao, Z., and Chen, J. (2005). “Debonding in RC beams shear strengthened with complete FRP wraps.” J. Compos. Constr., 9(5), 417–428.
Carolin, A., and Täljsten, B. (2005). “Experimental study of strengthening for increased shear bearing capacity.” J. Compos. Constr., 9(6), 488–496.
Chaallel, O., Nollet, M.-J., and Perraton, D. (1998). “Shear strengthening of RC beams by externally bonded side CFRP strips.” J. Compos. Constr., 2(2), 111–113.
Deniaud, C., and Cheng, J. J. R. (2004). “Simplified shear design method for concrete beams strengthened with fiber reinforced polymer sheets.” J. Compos. Constr., 8(5), 425–433.
Diagana, C., Li, A., Gedalia, B., and Dlemas, Y. (2003). “Shear strengthening effectiveness with CFF strips.” Eng. Struct., 25, 507–516.
Guadagnini, M., Pilakoutas, K., and Waldron, P. (2006). “Shear resistance of FRP RC beams: Experimental study.” J. Compos. Constr., 10(6), 464–473.
Higgins, C., Farrow, W. C., Nicholas, B. S., and Potisuk, T. (2006). “High-cycle fatigue of diagonally cracked reinforced concrete bridge girders: Field tests.” J. Bridge Eng., 11(6), 699–706.
Hutchinson, R., Donald, D., and Rizkalla, S. (1999). “FRP for shear strengthening of AASHTO bridge girders.” Proc., Structural Faults and Repair, Engineering Technical Press, London.
Khalifa, A., Gold, W. J., Nanni, A., and Aziz, A. M. I. (1998). “Contribution of externally bonded FRP to shear capacity of RC flexural members.” J. Compos. Constr., 2(4), 195–202.
Pellegrino, C., and Modena, C. (2002). “Fiber reinforced polymer shear strengthening of reinforced concrete beams with transverse steel reinforcement.” J. Compos. Constr., 6(2), 104–111.
Petty, D. A. (2010). “Full-scale testing of 40 year old prestressed AASHTO girders that have been retrofitted in shear by externally applied carbon fiber reinforced polymer wraps.” M.S. thesis, Utah State Univ., Logan, UT, 165.
Osborn, G. P. (2010). “Ultimate shear capacity and residual prestress force of full scale forty one year old prestressed concrete girders.” M.S. thesis, Utah State Univ., Logan, UT, 162.
Razaqpur, A. G., Shedid, M., and Isgor, B. (2011). “Shear strength of fiber reinforced polymer reinforced concrete beams subject to unsymmetric loading.” J. Compos. Constr., 15(4), 500–512.
Zhang, Z., and Hsu, C. T. (2005). “Shear strengthening of reinforced concrete beams using carbon-fiber-reinforced polymer laminates.” J. Compos. Constr., 9(2), 158–169.
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© 2011 American Society of Civil Engineers.
History
Received: Aug 12, 2010
Accepted: Jan 24, 2011
Published online: Jan 26, 2011
Published in print: Oct 1, 2011
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