Effect of Fiber Orientation and Ply Mix on Fiber Reinforced Polymer-Confined Concrete
Publication: Journal of Composites for Construction
Volume 9, Issue 5
Abstract
This paper explores the effects of fiber orientation and ply mix on load–deformation behavior and failure modes of fiber reinforced polymer (FRP) confined concrete by testing under uniaxial compression a designed array of plain concrete cylinders wrapped with different fabric orientation. Depending on the jacket confinement stiffness, either a strain hardening or a strain softening behavior was observed beyond the kink point where there was a sharp reduction in slope in the load–deformation curve. Kinking was seen to have a definable graphical relationship with the critical concrete lateral strain while the kink stress was found to upshift with increasing jacket stiffness. It is concluded that while hoop fiber wrapped concrete leads to brittle failures, angular fiber wrapped concrete tends to fail in a ductile manner, attributed to a fiber reorientation mechanism. Ply mix sequence plays an important role in the overall deformation and failure behavior. Existing models are found to be adequate in describing load–deformation behavior of angular fiber wrapped concrete as long as equivalent FRP properties in the hoop direction are used.
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Acknowledgments
The writers acknowledge the support provided, in the form of materials and usage of test facilities, by the Department of Civil and Environmental Engineering of Massachusetts Institute of Technology. Special thanks are also due to Fyfe Co. LLC Ltd. for providing FRP materials and for assistance in jacket installation.
References
American Society for Testing and Materials (ASTM). (2003a). “Standard practice for capping cylindrical concrete specimens.” ASTM C617, Philadelphia.
American Society for Testing and Materials (ASTM). (2003b). “Standard test method for compressive strength of cylindrical concrete specimens.” ASTM C39, Philadelphia.
Fyfe Co. LLC (2000). Design manual for the Tyfo® Fibrwrap® System Rev. 2.
Hoppel, C. P. R., and Bogetti, T. A. G. (1997). “Design and analysis of a composite wraps for concrete columns.” J. Reinf. Plast. Compos., 16(7), 588–602.
Howie, I. (1995). “A study on the use of composite wraps for rehabilitation of deteriorated concrete columns.” Master thesis, Univ. of Delaware, Newark, Del.
Howie, I., and Karbhari, V. M. (1995). “Effect of two sheet composite wrap architecture on strengthening of concrete due to confinement: I—Experimental studies.” J. Reinf. Plast. Compos., 14, 1008–1030.
Karbhari, V. M., Eckel, D. A., and Tunis, G. C. (1993). “Strengthening of concrete column stubs through resin infused composite wraps.” J. Therm. Comp. Mat., 6, 92–106.
Karbhari, V. M., and Gao, Y. (1997). “Composite jacketed concrete under uniaxial compression—Verification of simple design equations.” J. Mater. Civ. Eng., 9(4), 185–193.
Lam, L., and Teng, J. G. (2000). “Strength models for FRP-confined concrete.” J. Struct. Eng., 128(5), 612–623.
Mander, J.B., Park, R., and Priestley, M. J.N. (1988). “Theoretical stress-strain model for confined concrete.” J. Struct. Eng., 114(8), 1804–1826.
Mirmiran, A., Kargahi, M., Samaan, M., and Shahawy, M. (1996). “Composite FRP-concrete column, with bi-directional external reinforcement.” Fiber Composites in Infrastructure: Proc., 1st International Conf. in Composites in Infrastructure ICCI’96.
Mirmiran, A., and Shahawy, M. (1997a). “Behavior of concrete columns confined by fiber composites.” J. Struct. Eng., 123(5), 583–590.
Mirmiran, A., and Shahawy, M. (1997b). “Dilation characteristics of confined concrete.” Mech. Cohesive-Frict. Mater., 2, 237–249.
Mirmiran, A., Shahawy, M., Samaan, M., Echary, H. E., Mastrapa, J. C., and Pico, O. (1998). “Effect of column parameters on FRP-confined concrete.” J. Compos. Constr., 2(4), 175–185.
Miyauchi, K., Inoue, S., Kuroda, T., and Kobayashi, A. (1999). “Strengthening effects of concrete column with carbon fiber sheet.” Trans. Jpn. Concr. Inst., 21, 143–150.
Nanni, A., and Bradford, N. M. (1995). “FRP jacketed concrete under uniaxial compression.” Constr. Build. Mater., 9(2), 115–124.
Neville, A. M. (1973). Properties of concrete, Wiley, New York.
Peters, S. T., ed. (1998). Handbook of composites, 2nd Ed., Chapman and Hall, London.
Picher, F., Rochette, P., and Labossiere, P. (1996). “Confinement of concrete cylinders with CFRP.” Fiber Composites in Infrastructure: Proc., 1st International Conf. on Composites in Infrastructure, Tuscon, Ariz., 829–841.
Saadatmanesh, H., Ehsani, M. R., and Li, M. W. (1994). “Strength and ductility of concrete columns externally reinforced with fiber composite straps.” ACI Struct. J., 91(4), 434–447.
Samaan, M., Mirmiran, A., and Shahawy, M. (1998). “Model of concrete confined by fiber composites.” J. Struct. Eng., 124(9), 1025–1031.
van Mier, J. G. M. (1984). “Complete stress-strain behavior and damaging status of concrete under multiaxial conditions.” Proc., RILEM/CEB Symp. on Concrete Under Multiaxial Conditions, INSA, Toulouse, France.
Watanabe, K., Nakamura, H., Honda, Y., Toyoshima, M., Iso, M., Fujimaki, T., Kaneto, M., and Shirai, N. (1997). “Confinement effect of FRP sheet on strength and ductility of concrete cylinders under uniaxial compression.” Proc., 3rd International Symp.—Non-Metallic (FRP) Reinforcement for Concrete Structures, Vol. 1, 233–240.
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Information
Published In
Journal of Composites for Construction
Volume 9 • Issue 5 • October 2005
Pages: 397 - 407
Copyright
© 2005 ASCE.
History
Received: Jul 13, 2004
Accepted: Mar 14, 2005
Published online: Oct 1, 2005
Published in print: Oct 2005
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