Novel Demountable Shear Connector for Accelerated Disassembly, Repair, or Replacement of Precast Steel-Concrete Composite Bridges
Publication: Journal of Bridge Engineering
Volume 22, Issue 9
Abstract
A novel demountable shear connector for precast steel-concrete composite bridges is presented. The connector uses high-strength steel bolts, which are fastened to the top flange of the steel beam with the aid of a special locking nut configuration that prevents bolts from slipping within their holes. Moreover, the connector promotes accelerated construction and overcomes the typical construction tolerance issues of precast structures. Most importantly, the connector allows bridge disassembly. Therefore, it can address different bridge deterioration scenarios with minimum disturbance to traffic flow including the following: (1) precast deck panels can be rapidly uplifted and replaced; (2) connectors can be rapidly removed and replaced; and (3) steel beams can be replaced, whereas precast decks and shear connectors can be reused. A series of push-out tests are conducted to assess the behavior of the connector and quantify the effect of important parameters. The experimental results show shear resistance, stiffness, and slip capacity significantly higher than those of welded shear studs along with superior stiffness and strength against slab uplift. Identical tests reveal negligible scatter in the shear load-slip displacement behavior. A design equation is proposed to predict the shear resistance with absolute error less than 8%.
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Acknowledgments
This work was financially supported by the Iraqi Ministry of Higher Education and Scientific Research (Ph.D. scholarship to the first author) and from the University of Warwick through its Strategic EPSRC Impact Fund (awarded to the second author). Hanson Cement & Packed Products Ltd. and Grace Construction Products Ltd. donated raw materials for the fabrication of the test specimens. Emeritus Professor Roger P. Johnson of the University of Warwick kindly reviewed interim technical reports and offered comments and advices of significant value. Dr. Melody Stokes of Warwick Ventures Ltd. facilitated the process of receiving constructive feedback from international structural engineering consulting firms. Technical staff of the University of Warwick provided valuable help with the experimental setup and program. The authors gratefully acknowledge the previously mentioned support. Any opinions, findings, and conclusions expressed in this paper are those of the authors and do not necessarily reflect the views of the previously mentioned sponsors and supporters.
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Published In
Journal of Bridge Engineering
Volume 22 • Issue 9 • September 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Aug 15, 2016
Accepted: Mar 8, 2017
Published online: Jun 22, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 22, 2017
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