Axial Compressive Behavior of Square and Rectangular High-Strength Concrete-Filled FRP Tubes
Publication: Journal of Composites for Construction
Volume 17, Issue 1
Abstract
This paper presents results of an experimental study on the behavior of square and rectangular high-strength concrete (HSC)-filled fiber-reinforced polymer (FRP) tubes (HSCFFT) under concentric compression. The effects of the tube thickness, sectional aspect ratio, and corner radius on the axial compressive behavior of concrete-filled FRP tubes (CFFT) were investigated experimentally through the tests of 24 CFFTs that were manufactured using unidirectional carbon fiber sheets and high-strength concrete with 78 MPa average compressive strength. As the first experimental investigation on the axial compressive behavior of square and rectangular HSCFFTs, the results of the study reported in this paper allow a number of significant conclusions to be drawn. First and foremost, test results indicate that sufficiently confined square and rectangular HSCFFTs can exhibit highly ductile behavior. The results also indicate that confinement effectiveness of FRP tubes increases with an increase in corner radius and decreases with an increase in sectional aspect ratio. It is also observed and discussed that HSCFFTs having tubes of low confinement effectiveness may experience a significant strength loss at the point of transition on their stress-strain curves. Furthermore, it is found that the behavior of HSCFFTs at this region differ from that of normal-strength CFFTs and that it is more sensitive to the effectiveness of a confining tube. Examination of the test results have also lead to a number of important observations on the influence of the key confinement parameters on the development and distribution of the hoop strains on the tubes of CFFTs, which are presented and discussed in the paper.
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Acknowledgments
The writer would like to thank Ms. Clarke and Messrs. Cuts, Schleuniger, and Sitaras, who have undertaken the tests reported in this paper as part of their undergraduate theses. This research is part of an ongoing program at The University of Adelaide on FRP-concrete composite columns.
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Published In
Journal of Composites for Construction
Volume 17 • Issue 1 • February 2013
Pages: 151 - 161
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 16, 2012
Accepted: Jul 23, 2012
Published online: Aug 7, 2012
Published in print: Feb 1, 2013
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