Shear Strength of Steel Fiber-Reinforced Concrete Dry Joints in Precast Segmental Bridges
Publication: Journal of Bridge Engineering
Volume 21, Issue 11
Abstract
Dry joints represent locations of discontinuity in precast concrete segmental bridges (PCSBs) through which compressive and shear stresses must be transmitted. Cracks in dry joints occur more easily than those in epoxy joints during the construction period or in service. Steel fiber-reinforced concrete (SFRC) with high rupture strength might be beneficial to the shear resistance of dry joints. In this study, shear behavior of various types of dry joints in PCSBs was investigated by experiments, especially focusing on shear strength of keyed dry joints of SFRC. The experimental parameters were joint types, concrete types, key numbers, contacting portions in the sliding plane, and horizontal confining stress levels. Cracking loads, cracking patterns, failure modes, and ultimate loads were recorded. Normalized shear stress-vertical slip curves and load-horizontal dilation relationships have been investigated. It can be concluded that the use of SFRC can improve shear strength and ductility of dry joints in PCSBs. The experimental results obtained from tests were compared with other design provisions. These provisions underestimate the shear capacity of single-keyed dry joint specimens of conventional concrete and SFRC and overestimate those of three-keyed dry joints of conventional concrete, whereas the design formula can accurately predict the shear strength of three-keyed dry joints of SFRC.
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ACKNOWLEDGMENTS
The research presented was sponsored by the science and technology grant scheme of Guangdong Provincial Department of Highway and Transportation of China (2011-02-46), by 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 the Guangdong Province in China. Visits to Guangdong University of Technology, China, by the third author were made possible by the Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 21 • Issue 11 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Nov 18, 2015
Accepted: May 26, 2016
Published online: Jun 27, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 27, 2016
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