Anchorage System to Prestress FRP Laminates for Flexural Strengthening of Steel-Concrete Composite Girders
Publication: Journal of Composites for Construction
Volume 17, Issue 3
Abstract
Using externally bonded (EB) fiber-reinforced polymer (FRP) laminates for strengthening steel-concrete composite girders has recently received more attention from researchers. By prestressing the EB FRP laminates, the material is used more efficiently because a greater portion of its tensile capacity is employed and it contributes to the load-bearing capacity under both service and ultimate conditions. This is an ideal technique because it combines the advantage of using noncorrosive and lightweight advanced composite materials in the form of bonded FRP laminates with the high efficiency offered by external prestressing. An innovative mechanical anchorage system was developed to prestress the FRP laminates directly by jacking and reacting against the steel girder itself. The efficiency of the system was investigated using two types of FRP laminates for flexural strengthening of large-scale steel-concrete composite girders. The used FRP composite materials included carbon-fiber-reinforced polymer (CFRP) plate and steel-fiber-reinforced polymer (SFRP) sheets. The developed anchorage/prestressing system was easy to use/apply and proved to be a feasible and practical system for prestressing both CFRP plate and SFRP sheet. The prestressing levels in the FRP laminates were sufficiently maintained. The prestressing losses were insignificant.
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Acknowledgments
The authors wish to express their gratitude to Moli Industries for providing their facilities to do the welding of the shear studs, Decon Studs for supplying the shear studs, Hardwire for supplying the steel-reinforced polymer sheets, Weatland Blasting for sandblasting the steel girders, Sika Canada for supplying the CFRP plates, CFRP sheets, and epoxy adhesives, technical staff at the University of Calgary for their indispensable help, and Mohamadreza Seraji (student) for preparing the AutoCAD drawings. Thanks to the Natural Sciences and Engineering Research Council of Canada for funding this research.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 17 • Issue 3 • June 2013
Pages: 324 - 335
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 15, 2011
Accepted: Aug 9, 2012
Published online: Nov 22, 2012
Published in print: Jun 1, 2013
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