Behavior of Ultrahigh-Performance Concrete Confined by Fiber-Reinforced Polymers
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 12
Abstract
Over a decade of studies have demonstrated the benefits of ultra high performance concrete (UHPC) in terms of damage tolerance, energy absorption, crack distribution, and deformation capacity. However, little information is available on the confinement behavior of UHPC, especially when confined with fiber-reinforced polymers (FRP). Sixteen UHPC-filled FRP tubes with different fiber type and tube thickness were tested under monotonic uniaxial compression. All specimens failed by rupture of the tube at or near the midheight. Similar to conventional concrete, test results showed significant enhancements in the ultimate strength and strain of UHPC—up to 98% and 195%, respectively, compared with its unconfined counterpart. The experimental results were compared with a number of available confinement models. Although one of the models provided a reasonable fit for the stress-strain response in most cases, all models generally underestimated the effectiveness of FRP confinement at higher confinement ratios. The study demonstrated the need for confinement models that could accurately predict the behavior of FRP-confined UHPC in terms of the stress-strain relationship and the respective ultimate strengths and strains.
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Acknowledgments
This study was sponsored by the NSF-Network for Earthquake Engineering Simulation Research (NEESR) program, as part of the multiuniversity Grant No. UNSPECIFIEDCMS-0420347. The writers are grateful to the Materials Office of the Florida Department of Transportation for testing the specimens; Lafarge, Inc. for providing the Ductal (UHPC) materials; and Sika Corp. for providing the FRP materials. Findings and opinions expressed here, however, are those of the authors alone and are not necessarily the views of sponsoring agencies.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 12 • December 2011
Pages: 1727 - 1734
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Nov 20, 2010
Accepted: Apr 15, 2011
Published online: Apr 18, 2011
Published in print: Dec 1, 2011
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