Model of FRP-Confined Concrete Cylinders in Axial Compression
Publication: Journal of Composites for Construction
Volume 13, Issue 5
Abstract
This paper introduces a dilatancy-based analytical model of the response of an axially loaded concrete cylinder, confined with a fiber-reinforced polymer (FRP) composite jacket. Model construction is based on the experimentally based observation that the relation between axial secant stiffness and the lateral (dilatancy) strain is effectively unique for cylinders with the same unconfined concrete strength, although the confinement levels may differ. Model development incorporates strength degradation of the concrete with dilatancy (lateral dilation); this feature allows one to demonstrate that the performance of FRP-confined concrete is consistent with the strength envelope obtained from triaxial tests. Model validation is accomplished by comparisons with existing test database and the new results on large-scale concrete cylinders. The results of the validation reveal good agreement with key response functions and parameters. The present study illustrates basic constitutive equations to model FRP-confined concrete in a more rational manner.
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Acknowledgments
Financial support for this research has been provided by the UNSPECIFIEDTechnical Support Working Group (TSWG) as part of a major research program at University of California, San Diego for developing FRP-based blast hardening techniques for RC columns.
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© 2009 ASCE.
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Received: Apr 16, 2008
Accepted: Feb 23, 2009
Published online: Mar 6, 2009
Published in print: Oct 2009
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