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Investigation of the Behavior of Offset Mechanical Splices

Coogler, Keith Lynn (2007) Investigation of the Behavior of Offset Mechanical Splices. Master's Thesis, University of Pittsburgh. (Unpublished)

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An experimental study of two commercially available offset mechanical reinforcement bar splice systems is presented. The two splice systems, the BarSplice Double Barrel Zap Screwlok© and the Lenton QuickWedge©, were evaluated in four series of tests with reinforcement bar sizes ranging from #4 to #6. The tests were as follows: Direct Tension which tested the splice in open-air tension and allowed the splice to rotate freely; Restrained Tension which tested the reinforcement splice in a manner that inhibited the splice from rotating; Fatigue testing cycled the specimens through a 20 ksi (172 MPa) stress range for 10,000 cycles; In situ beam tests embedded the splices in concrete beams. The beams were subjected to monotonic testing to failure with and without initial fatigue conditioning.Observations from the tension tests indicate current test methods do not effectively evaluate offset splices. Current practice assumes direct tension testing to be a conservative method for evaluating the ultimate load carrying capacity, and the slip through the splice. Due to rotation produced by the self aligning loads, there is an increase in load carrying capacity caused by large frictional forces at the face of the coupler. The restrained tension tests show promise as an effective test method for mitigating these large friction forces, and more accurately predicting in situ behavior of these types of splices, particular expected slip performance.Fatigue testing for offset mechanical splices proved to be an impractical test method for this type of splice. Results from this program correlate with the limiting stress restrictions contained in current design provisions. Flexural beam tests demonstrated that there was little degradation from fatigue conditioning on the performance of the splice. In situ tests also demonstrated that concrete was unable to confine the splice and prevent rotation near ultimate load levels.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Coogler, Keith Lynnklc44@pitt.eduKLC44
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairHarries, Kent Akharries@engr.pitt.eduKHARRIES
Committee MemberVandenbossche, Julie Mjmv@engr.pitt.eduJMV7
Committee MemberRizzo, Piervincenzoprizzo@engr.pitt.eduPIR3
Date: 31 January 2007
Date Type: Completion
Defense Date: 13 November 2006
Approval Date: 31 January 2007
Submission Date: 17 November 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: Mechanical Reinforcement Bar Splices; Mechanical Splices; Offset Mechanical Splices; Reinforcement Bar
Other ID:, etd-11172006-153105
Date Deposited: 10 Nov 2011 20:05
Last Modified: 15 Nov 2016 13:51


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