Posttensioned FRP Composite Shells for Concrete Confinement
Publication: Journal of Composites for Construction
Volume 11, Issue 1
Abstract
Experiments have shown that externally bonded fiber-reinforced polymer (FRP) jackets for square and rectangular columns are not as effective as they are for circular columns. The results of experiments on shape-modified concrete columns using posttensioned FRP shells are presented. Posttensioning was achieved by radially straining the precured FRP shell outwards to a substantial strain level, using expansive cement concrete, over a period of . The prefabricated FRP shell was also used as a stay-in-place formwork. The effectiveness of shape modification using posttensioned FRP shells is compared to FRP-confined original square and rectangular columns, as well as shape-modified columns with nonshrink grout and externally bonded FRP jackets. It is shown that shape modification with posttensioning of FRP shells, using expansive cement concrete, can change the confinement from passive to active and improve significantly the axial strength and ultimate compressive axial strain capacity of square and rectangular columns.
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Acknowledgments
The writers would like to acknowledge financial support by the Utah Department of Transportation, the contribution of FRP composite materials from Sika and Air Logistics, and the contribution of Type K cement and Komponent from CTS Company. The writers acknowledge the constructive comments made by the reviewers.
References
American Concrete Institute (ACI). (1980). “Cedric Willson Symposium on expansive cement.” ACI SP-64, Detroit.
American Concrete Institute (ACI). (1998). “Standard practice for the use of shrinkage-compensating concrete.” ACI Committee 223, ACI 223, Farmington Hills, Mich.
ASTM. (2001). “Standard test method for tensile properties of polymer matrix composite materials.” ASTM Standards, 15.03, ASTM D 3039, West Conshohocken, Pa., 105–115.
ASTM. (2004). “Standard specification for expansive hydraulic cement.” ASTM Standards, 04.01, ASTM C-845, West Conshohocken, Pa.
Benuska, K. L., Bertero, V. V., and Polivka, M. (1971). “Self-stressed concrete for precast building units.” PCI J., 16(2), 72–84.
Klein, A., Karby, T., and Polivka, M. (1961). “Properties of an expansive cement for chemical prestressing.” ACI J., 58(1), 59–82.
Lam, L., and Teng, J. G. (2003). “Design-oriented stress-strain model for FRP-confined concrete in rectangular columns.” J. Reinf. Plast. Compos., 22(13), 1149–1186.
Mirmiran, A., and Shahawy, M. (1997). “Behavior of concrete columns confined by fiber composites.” J. Struct. Eng., 123(5), 583–590.
Pantazopoulou, S. J., Bonacci, J. F., Sheikh, S., Thomas, M. D. A., and Hearn, N. (2001). “Repair of corrosion-damaged columns with FRP wraps.” J. Compos. Constr., 5(1), 3–11.
Pantelides, C. P., Yan, Z., and Reaveley, L. D. (2004). “Shape modification of rectangular columns confined with FRP composites.” Research Rep. No. CVEEN-04/4, Dept. of Civil and Environmental Engineering, Univ. of Utah, Salt Lake City, Dec. 2004, 166 pp.
Pessiki, S., Harries, K. A., Kestner, J. T., Sause, R., and Ricles, J. M. (2001). “Axial behavior of reinforced concrete columns confined with FRP jackets.” J. Compos. Constr., 5(4), 237–245.
Rochette, P., and Labossière, P. (2000). “Axial testing of rectangular column models confined with composites.” J. Compos. Constr., 4(3), 129–136.
Sheikh, S. A., Fu, Y., and O’Neill, M. W. (1994). “Expansive cement concrete for drilled shafts.” ACI Mater. J., 91(3), 237–245.
Teng, J. G., and Lam, L. (2002). “Compression behavior of carbon fiber reinforced polymer-confined concrete in elliptical columns.” J. Struct. Eng., 128(12), 1535–1543.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 11 • Issue 1 • February 2007
Pages: 81 - 90
Copyright
© 2007 ASCE.
History
Received: Jun 24, 2005
Accepted: Mar 24, 2006
Published online: Feb 1, 2007
Published in print: Feb 2007
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