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The Experimental Behavior of Steel Fiber Reinforced Polymer Retrofit Measures

Minnaugh, Patrick Lucien (2007) The Experimental Behavior of Steel Fiber Reinforced Polymer Retrofit Measures. Master's Thesis, University of Pittsburgh. (Unpublished)

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Four 10" (254 mm) deep, 6" (152 mm) wide and 186" (4730 mm) long concrete beams having three #4 longitudinal steel reinforcing bars as primary flexural reinforcement, were retrofitted with steel fiber-reinforced polymer (SFRP). A commercially available 4.75 in. (121 mm) wide, 0.048 in. (1.2 mm) thick unidirectional steel fiber reinforced strip system was used along with a commercially available adhesive system. One beam was tested monotonically under simply supported conditions to failure. Three identical beams were tested under midpoint cyclic loading until fatigue-induced failure or 2,000,000 cycles. Any beam that survived 2,000,000 cycles was tested monotonically to failure. Results of the tests were compared to beams that were retrofitted with an equivalent amount of carbon fiber reinforced polymer (CFRP) as determined by the axial stiffness of the material.The monotonic test revealed that the SFRP specimen showed comparable behavior when compared to the CFRP companion specimens in terms of ultimate load and deflection, general yield load, and deflection ductility. The SFRP specimen was shown to compare poorly in terms of debonding strain. One fatigue specimen achieved 2,000,000 cycles and was subsequently tested monotonically to failure. The behavior of the SFRP system degraded only slightly in terms of each parameter considered; thus it was apparent that SFRP systems may perform well under fatigue conditions. Debonding strains for the SFRP were still shown to be very low, indicating that the guidance for the mitigation of CFRP specimens may not be appropriate to apply directly to SFRP specimens.Two of the retrofit fatigue specimens failed due to fatigue-induced rupture of the internal reinforcement prior to achieving 2,000,000 cycles. Observations include stress range drift and degradation of secant stiffness with cycling. Reinforcing bar stresses at the final cycle were noted to increase significantly from the initial cycle. The SFRP was noted to increase the secant stiffness of the retrofit specimens and slow the rate of decay of stiffness when compared to the control fatigue specimen. When results were compared to the CFRP companion specimens, it was apparent that SFRP is an acceptable retrofit and is in some ways superior in terms of fatigue.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Minnaugh, Patrick Lucienplm49@pitt.eduPLM49
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairHarries, Kent Akharries@engr.pitt.eduKHARRIES
Committee MemberKoubaa ,
Committee MemberRizzo, Piervincenzoprizzo@engr.pitt.eduPIR3
Date: 31 January 2007
Date Type: Completion
Defense Date: 4 October 2006
Approval Date: 31 January 2007
Submission Date: 16 October 2006
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
Degree: MSCE - Master of Science in Civil Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: bond; fatigue; monotonic; reinforced concrete; SFRP
Other ID:, etd-10162006-142447
Date Deposited: 10 Nov 2011 20:03
Last Modified: 15 Nov 2016 13:50


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