Strength-Fatigue Behavior of Fiber Reinforced Polymer Strengthened Prestressed Concrete T-Beams
Publication: Journal of Composites for Construction
Volume 9, Issue 4
Abstract
Strengthening concrete girders with fiber-reinforced polymers (FRP) is becoming an increasingly common practice as more research investigations are favorably qualifying the technique. However, important behavioral aspects, such as fatigue in prestressed concrete beams, are yet to be adequately evaluated. An experimental program was conducted to test five pretensioned, prestressed concrete T beams designed for specific prestressing strand stress ranges under live-load conditions. The experimental testing consisted of precracking the beams, strengthening them with carbon FRP, and mechanically loading them to study the effect of increasing the live load on strand fatigue. The beams were either loaded monotonically to ultimate capacity or cyclically fatigued and then loaded monotonically to failure. All the beams were monotonically loaded past their cracking moment at midspan prior to strengthening, to simulate girders in the field. Beam 1 was tested as a control specimen under static loading up to failure. Beams 2 and 3 were strengthened with carbon FRP to have a design stress range of 124 MPa (18 ksi) under service load condition. Beams 4 and 5 were strengthened to have a higher stress range of 248 MPa (36 ksi). For all the strengthened beams, the failure mode observed was FRP rupture. The results favorably qualify the application of FRP strengthening to increase the live load of concrete beams prestressed with straight strands.
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Acknowledgments
This study was funded by the Kansas Department of Transportation (KDOT) and by the University Transportation Center at the University of Missouri, Rolla, Mo. CFRP strengthening materials were proved by Master Builders, Inc. Thanks are extended to Mr. David A. Meggers and Mr. Calvin E. Reed of KDOT for their help with this project.
References
American Association of State Highway Transportation Officials (AASHTO). (1998). LRFD bridge design specifications, 2nd Ed., Washington, D.C.
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R02 ACI, Committee 440, Farmington Mills, Mich.
Bakis, C. E., et al. (2002). “Fiber-reinforced polymer composites for construction—State-of-the-art review.” J. Compos. Constr., 6(2), 73–87.
Hassan, T., and Rizkalla, S. (2002). “Flexural strengthening of prestressed bridge slabs with FRP systems.” PCI J., 47(1), 76–93.
ISIS Canada. (2001). Design manual 4: Strengthening reinforced concrete structures with externally-bonded fiber reinforced polymers. Canadian Network of Centers of Excellence on Intelligent Sensing for Innovative Structures, Univ. of Manitoba, Winnipeg, Man., Canada.
Larson, K. H. (2003). “Behavior of FRP strengthened reinforced and prestressed concrete girders in flexure, shear and delamination.” MS thesis, Kansas State Univ., Manhattan, Kan., 164.
Larson, K. H., Rasheed, H. A., and Peterman, R. J. (2004). “Developing a nonlinear strength-fatigue design procedure for FRP strengthening of prestressed concrete girders.” Proc., 17th Engineering Mechanics Conf., ASCE, Reston, Va., CD ROM.
M-Brace. (1998). M-Brace Composite Strengthening System-Engineering Design Guidelines, 2nd Ed., Master Builders Technologies, Cleveland.
Meier, U., (1987). “Brülckensanierung mit hochleistungs-faserverbundwerkstoffen.” Mater. Tech. (Duebendorf, Switz.), 15, 125–128 (in German).
Precast/Prestressed Concrete Institute (Precast/PCI). (1999). PCI design handbook, 5th Ed., Chicago.
Reed, C. (2002). “Strengthening of 30 year old prestressed concrete bridge girders with carbon fiber reinforced polymers.” MS thesis, Kansas State Univ., Manhattan, Kan.
Reed, C. E., and Peterman, R. J. (2004). “Evaluation of prestressed concrete girders strengthened with carbon fiber reinforced sheets.” J. Bridge Eng., 9(2), 185–192.
Reed, C. E., Peterman, R. J., and Rasheed, H. A. (2004). “Evaluating FRP repair method for cracked prestressed concrete bridge members subjected to repeated loadings (Phase 1).” Final Rep. No. K-TRAN: KSU 01-02, Kansas Dept. of Transportation, Topeka, Kan.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 9 • Issue 4 • August 2005
Pages: 313 - 326
Copyright
© 2005 ASCE.
History
Received: Feb 5, 2004
Accepted: Dec 2, 2004
Published online: Aug 1, 2005
Published in print: Aug 2005
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