Shear-Friction Behavior of Groove Interface in Concrete Bridge Rehabilitation
Publication: Journal of Bridge Engineering
Volume 21, Issue 11
Abstract
This study focuses on the shear-friction behavior of a groove interface with transverse reinforcement between existing concrete and newly poured concrete, which has been adopted in the rehabilitation project of three prestressed concrete box girder bridges in China. A series of push-off specimens with groove interfaces was tested with parameters of concrete strength, groove geometry, and reinforcement ratio. For comparison purposes, monolithic specimens and roughened specimens with or without transverse reinforcement were also tested to failure. Cracking loads, ultimate loads, residual strengths, cracking patterns, and failure modes were recorded. Load-slip curves, load-dilation behaviors, and load-strain relationships in steel reinforcement have been investigated. The groove on the surface of the existing concrete can significantly enhance shear-friction capacity of the interface between new and existing concrete. The transverse reinforcement can improve deformation capacity and residual resistance. The nonsimultaneous failure of concrete and steel reinforcement is revealed. Based on the shear-friction mechanism, the test results are compared with the existing design provisions. Design details on applying the proposed groove interface in the actual bridge rehabilitation are suggested.
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Acknowledgments
The research presented was sponsored by the science and technology grant scheme of the Department of Highway and Transportation of Guangdong Province in China (2011-02-46), the science and technology grant scheme of the Department of Education of Guangdong Province in China (2014KTSCX060), and the Science and Technology Development Special Fund (Basic and Applied Basic Research Branch) of Guangdong Province in China (2016A030313699). Visits to Guangdong University of Technology, China, by the third author were made possible by the Department of Civil and Environmental Engineering of the University of Tennessee, Knoxville. The authors also acknowledge the assistance provided by W. H. Guo and L. N. Liang in the Guangdong Provincial Highway Planning and Design Institute who designed the groove interface in bridge rehabilitation projects and presented the abundant design information.
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Information
Published In
Journal of Bridge Engineering
Volume 21 • Issue 11 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 27, 2015
Accepted: Apr 27, 2016
Published online: Jun 27, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 27, 2016
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