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Use of High-Strength Steel Reinforcement in Shear Friction Applications

Zeno, Gabriel Augusto (2010) Use of High-Strength Steel Reinforcement in Shear Friction Applications. Master's Thesis, University of Pittsburgh. (Unpublished)

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This thesis reports the results of a study associated with Task 8.4b of the National Cooperative Highway Research Program (NCHRP) Project 12-77 Structural Concrete Design with High-Strength Steel Reinforcement. The objective of the study is to evaluate the effects of the use of high-strength steel reinforcement in shear friction applications. Shear friction is the mechanism present when shear is transferred across an interface between two concrete members that can slip relative to one another. It arises from the roughness of the interface and the clamping force created by the steel reinforcement across it.The study was accomplished by testing typical push-off specimens with a cold joint test interface, which had a surface roughness with at least ¼-inch amplitude in order to simulate the connection between a composite slab and an AASHTO girder. The parameters measured during the tests were the magnitude of the shear load, the shear displacement or "slip" parallel to the test interface, the crack width perpendicular to the test interface, and the strain in the steel reinforcement across the test interface.The test results showed that the shear friction mechanism occurs in stages and that the concrete component contributes to the majority of the shear friction capacity; the steel component develops only after significant cracking. In other words, the concrete and steel components of the shear friction mechanism do not act simultaneously as implied by current design standards. In addition, the test results showed that, contrary to the assumptions of the AASHTO and ACI equations to calculate the shear friction capacity of concrete members, the interface steel reinforcement never reaches its yield strain. Therefore, the use of high-strength reinforcing steel does not affect the shear friction capacity of concrete members because the clamping force that is part of the shear friction mechanism is a function of the elastic modulus of the steel rather than its yield strength. Based on these findings and using the experimental data from current and previous tests an alternative equation is proposed for the calculation of the shear friction capacity of reinforced concrete members.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Zeno, Gabriel Augustogaz6@pitt.eduGAZ6
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairHarries, Kent Akharries@pitt.eduKHARRIES
Committee MemberBrigham, Johnbrigham@pitt.eduBRIGHAM
Committee MemberVandenbossche, Juliejmv7@pitt.eduJMV7
Date: 26 January 2010
Date Type: Completion
Defense Date: 21 October 2009
Approval Date: 26 January 2010
Submission Date: 14 November 2009
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: high strength steel reinforcement; NCHRP 12-77; shear friction
Other ID:, etd-11142009-163350
Date Deposited: 10 Nov 2011 20:04
Last Modified: 15 Nov 2016 13:51


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