Stress-Strain Model of Ultrahigh Performance Concrete Confined by Fiber-Reinforced Polymers
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 12
Abstract
The application of ultrahigh performance concrete (UHPC) as an alternative to conventional concrete has grown rapidly in recent years. However, to date, little is known about the confinement behavior of UHPC, knowledge that is necessary to develop design guidelines for UHPC columns. In a previous study, the authors investigated the stress-strain behavior of a series of UHPC-filled fiber-reinforced polymer (FRP) tubes with different fiber types and thicknesses under uniaxial compression. The FRP confinement was shown to significantly enhance both the ultimate strength and strain of UHPC. It was also shown that the existing confinement models are incapable of predicting the behavior of FRP-confined UHPC. Therefore, in this study, two commonly used FRP confinement models are recalibrated based on test results of FRP-confined UHPC. A model was further modified based on the stress-strain model of unconfined UHPC to better capture the linear response of UHPC before the activation of FRP confinement. A comparison of the three models showed that a recalibrated model provides the most accurate prediction of the stress-strain behavior of FRP-confined UHPC in terms of the stress-strain curve and ultimate strength and strain.
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Acknowledgments
This study was sponsored in part by the NSF-Network for Earthquake Engineering Simulation Research (NEESR) program, as part of the multi-university Grant No. CMS-0420347. The first writer is also thankful to the Graduate School at Florida International University for providing him with a Dissertation Year Fellowship to complete his doctoral work. Findings and opinions expressed here, however, are those of the authors alone, and not necessarily the views of sponsoring agencies.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 12 • December 2013
Pages: 1822 - 1829
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 30, 2012
Accepted: Dec 27, 2012
Published online: Dec 29, 2012
Discussion open until: May 29, 2013
Published in print: Dec 1, 2013
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