Novel UHPC-CFRP Waffle Deck Panel System for Accelerated Bridge Construction
Publication: Journal of Composites for Construction
Volume 20, Issue 1
Abstract
A novel deck system is developed as an ultralightweight low profile waffle slab of ultrahigh-performance concrete (UHPC) reinforced with carbon-fiber-reinforced polymer (CFRP) bars. The proposed system lends itself to accelerated bridge construction, and has great potential for deck replacement in bridges with load restrictions, and as well for bridge widening. A total of seven specimens at two different overall depths, with single or multiple ribs and in simple or two-span configuration, were tested in two consecutive phases in this study. The results were compared to similar deck panels with high-strength steel (HSS) reinforcement from previous studies. The study confirmed that the proposed deck panel with only 102 mm overall depth and a self-weight of meets the demand for a 1,219-mm stringer spacing. The flexural behavior and failure modes of the deck are in general similar to the UHPC-HSS deck. The deck is not susceptible to punching shear of its thin slab and fails in a ductile manner. Load distribution among the ribs, whether calculated based on deflections or strains, is about 33% for the center rib, and 22 and 11% for the next two ribs.
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Acknowledgments
This study was sponsored by the Florida Department of Transportation under the supervision of Mr. Sam Fallaha and Mr. William Potter as Project Managers. Additional support was provided by the National Center for Transportation Systems Productivity and Management (NCTSPM) University Transportation Center (UTC) at the Georgia Institute of Technology to broaden the applications of the proposed lightweight deck system for accelerated bridge construction. The support of Lafarge North America for providing its UHPC (Ductal) and Hughes Brothers of Seaward, Nebraska, for providing its CFRP bars are gratefully acknowledged. The Styrofoam forms were prepared at the University of Central Florida. All experiments were conducted at the Titan America Structures and Construction Testing Laboratory of the Florida International University. The views and findings reported here are those of the writers alone, and not necessarily the views of the sponsoring agency.
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Published In
Journal of Composites for Construction
Volume 20 • Issue 1 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Feb 16, 2015
Accepted: Jun 22, 2015
Published online: Aug 4, 2015
Discussion open until: Jan 4, 2016
Published in print: Feb 1, 2016
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