Flexural Behavior of Concrete Beams Internally Prestressed with Unbonded Carbon-Fiber-Reinforced Polymer Tendons
Publication: Journal of Composites for Construction
Volume 17, Issue 2
Abstract
The objective of this research was to experimentally investigate the effects of the prestressing reinforcement ratio, the magnitude of the prestressing force, the loading type, and the sectional shape on the flexural behavior of beams internally prestressed with unbonded carbon-fiber-reinforced polymer (CFRP) tendons. Four rectangular and three T-beams were tested. Test results have shown that, even for the unbonded prestressing ratio less than the balanced ratio of the bonded equivalent, unbonding the CFRP tendons could relieve tendon strains along the beam span and delay the rupture of CFRP tendons. Improved ductility was observed for the rectangular beams prestressed with unbonded CFRP tendons and non-prestressed auxiliary bonded steel bars when compared with prestressed beams that have bonded CFRP tendons.
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Acknowledgments
The research in this paper comprises part of the Construction Technology Innovation Program (CTIP) that was financially supported by Ministry of Land, Transport and Maritime Affairs in Korea. The authors wish to express their gratitude for the financial support.
References
American Concrete Institute (ACI) Committee 318. (2011). “Building code requirements for structural concrete and commentary.”, Farmington Hills, MI.
American Concrete Institute (ACI) Committee 440. (2004). “Prestressing concrete structures with FRP tendons.”, Farmington Hills, MI.
Burgoyne, C. J. (1993). “Should FRP be bonded to concrete?”, American Concrete Institute, Farmington Hills, MI, 367–380.
Burgoyne, C. J. (2001). “Rational use of advanced composites in concrete.” Struct. Build., 146(3), 253–262.
Burke, C. R., and Dolan, C. W. (2001). “Flexural design of prestressed concrete beams using FRP tendons.” PCI J., 46(2), 76–87.
Dolan, C. W., and Swanson, D. (2002). “Development of flexural capacity of a FRP prestressed beam with vertically distributed tendons.” Compos. Part B: Eng., 33(1), 1–6.
Du, J. S., Au, F. T. K., Cheung, Y. K., and Kwan, A. K. H. (2008). “Ductility analysis of prestressed concrete beams with unbonded tendons.” Eng. Struct., 30(1), 13–21.
Ehsani, M. R., Saadatmanesh, H., and Nelson, C. H. (1997). “Transfer and flexural bond performance of aramid and carbon FRP tendons.” PCI J., 42(1), 76–86.
Grace, N. F. (1994). “Prestressed concrete girders with web openings under static, dynamic, fatigue and ultimate loadings.” Rep. to the National Science Foundation, Lawrence Technological Univ., Southfield, MI.
Grace, N. F., et al. (2008). “Flexural behavior of precast concrete box beams post-tensioned with unbonded, carbon-fiber-composite cables.” PCI J., 92(6), 62–81.
Grace, N. F., and Abdel-Sayed, G. (1998). “Ductility of prestressed bridges using CFRP strands.” Concr. Int., 20(6), 25–30.
Grace, N. F., Enomoto, T., Sachidanandan, S., and Puravankara, S. (2006). “Use of CFRP/CFCC reinforcement in prestressed concrete box-beam bridges.” ACI Struct. J., 103(1), 123–132.
Jeong, S. M. (1994). “Evaluation of ductility in prestressed concrete beams using fiber reinforced plastic tendons.” Ph.D. dissertation, Univ. of Michigan, Ann Arbor, MI.
Kato, T., and Hayashida, N. (1993). “Flexural characteristics of prestressed concrete beams with CFRP tendons.” Proc., Int. Symp. Fiber-Reinforced-Plastic Reinforcement for Concrete Structures, SP-138, American Concrete Institute, Farmington Hills, MI.
Maissen, A., and De Smet, C. A. M. (1995). “Comparison of concrete beams prestressed with carbon fibre reinforced plastic and steel strands.” Non-metallic (FRP) reinforcement for concrete structures, L. Taewre, ed., E & FN Spon, London, 430–439.
Naaman, A. E., and Alkhairi, F. M. (1991a). “Stress at ultimate in unbonded post-tensioning tendons: Part 1—Evaluation of the state-of-the-art.” ACI Struct. J., 88(5), 641–651.
Naaman, A. E., and Alkhairi, F. M. (1991b). “Stress at ultimate in unbonded post-tensioning tendons: Part 2—Proposed methodology.” ACI Struct. J., 88(6), 683–692.
Naaman, A. E., and Jeong, S. M. (1995). “Structural ductility of concrete beams prestressed with FRP tendons.” Non-metallic (FRP) reinforcement for concrete structures, L. Taewre, ed., E & FN Spon, London, 379–386.
Naaman, A. E., Tan, K. H., Jeong, S. M., and Alkhiri, F. M. (1993). “Partially prestressed beams with carbon fiber composite strands: Preliminary tests evaluation.” Proc., Int. Symp. Fiber Reinforced Plastic Reinforcement for Concrete Structures, ACI SP 138-27, American Concrete Institute, Farmington Hills, MI, 441–464.
Orozco, A. L., and Maji, A. K. (2004). “Energy release in fiber-reinforced plastic reinforced concrete beams.” J. Compos. Constr., 8(1), 52–58.
Taniguchi, H., Mutsuyoshi, H., Kita, T., and Machida, A. (1993). “Ductile behavior of beams using FRP as tendons and transverse reinforcement.” Proc., Int. Symp. Fiber Reinforced Plastic Reinforcement for Concrete Structures, ACI SP 138-39, American Concrete Institute, Farmington Hills, MI, 651–670.
Yonekura, A., Tazawa, E., and Nakayama, H. (1993). “Flexural and shear behavior of prestressed concrete beams using FRP rods as prestressing tendons.” Proc., Int. Symp. Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures, ACI SP 138-32, American Concrete Institute, Farmington Hills, MI, 525–548.
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Published In
Journal of Composites for Construction
Volume 17 • Issue 2 • April 2013
Pages: 167 - 175
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 29, 2011
Accepted: Jul 23, 2012
Published online: Aug 7, 2012
Published in print: Apr 1, 2013
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