Experimental Study on Shear Behavior of Reinforced-Concrete Members Fully Wrapped with Large Rupture-Strain FRP Composites
Publication: Journal of Composites for Construction
Volume 18, Issue 3
Abstract
This paper presents an experimental study on the shear behavior of RC members fully wrapped with polyethylene terephthalate (PET) fiber-reinforced polymer (FRP) composites, which are a new type of FRP material characterized by a much larger rupture strain (LRS) compared with conventional FRPs (i.e., made of carbon, glass, and aramid fibers). A total of 10 PET fully-wrapped RC beams, which were designed to fail in shear and with different shear-span to effective-depth ratios, transverse reinforcement ratios and shear strengthening ratios, were tested under 4-point bending loads. The overall load-deflection responses and the shear deformation of the beams as well as the strain development of the transverse steel reinforcement and the FRP jackets were carefully observed. Based upon the extensive strain measurements, the shear contributions by concrete, FRPs, and transverse reinforcement are differentiated. It was found that the use of PET FRP composites as the jacket material of RC members could shift the mode of shear failure from a brittle one to an ideal ductile one whereas the ultimate state of the members is no longer caused by FRP fracture. In order to efficiently predict the shear strength of RC members wrapped by LRS FRPs, the effective strain in LRS FRPs and the degradation of concrete at the peak member shear strength should be appropriately considered.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The authors would like to acknowledge Mr. Hiroshi Nakai of Maeda Kosen Co. Ltd, Japan, for providing invaluable advice to this study and the Aramid Reinforcement Association, Japan, for providing epoxy resins and PET fiber sheets for this study. The authors are also grateful to the financial aid provided by the Grant-in-Aid for Scientific Research (A) in Japan (Project Code: 22246058) and the collaboration opportunity provided by The Hong Kong Polytechnic University through the National Natural Science Foundation of China (Project Code: 51172146).
References
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.”, Farmington Hills, MI.
Anggawidjaja, D., Ueda, T., Dai, J., and Nakai, H. (2006). “Deformation capacity of RC piers wrapped by new fiber-reinforced polymer with large fracture strain.” Cement and Concrete Composites, 28(10), 914–927.
Bai, Y. L., Dai, J. G., and Teng, J. G. (2013). “Cyclic compressive behavior of concrete confined with large rupture strain FRP composites.” J. Compos. Constr., in press.
Bakis, C. E., et al. (2002). “Fiber-reinforced polymer composites for construction-state-of-the-art review.” J. Compos. Constr., 73–87.
Dai, J. G., Bai, Y. L., and Teng, J. G. (2011). “Behavior and modeling of concrete confined with FRP composites of large deformability.” J. Compos. Constr., 963–973.
Dai, J. G., Lam, L., and Ueda, T. (2012). “Seismic retrofit of square RC columns with polyethylene terephthalate (PET) fibre reinforced polymer composites.” Constr. Build. Mater., 27(1), 206–217.
Dai, J. G., and Ueda, T. (2012). “Strength and deformability of concrete members wrapped with fibre reinforced polymer composites with a large rupture strain.” Innovative material and techniques in concrete construction, Springer, Netherlands, 225–241.
Grande, E., Imbimbo, M., and Rasulo, A. (2009). “Effect of transverse steel on the response of RC beams strengthened in shear by FRP: Experimental study.” J. Compos. Constr., 405–414.
Iacobucci, R. D., Sheikh, S. A., and Bayrak, O. (2003). “Retrofit of square concrete columns with carbon fiber-reinforced polymer for seismic resistance.” ACI Struct. J., 100(6), 785–794.
International Federal for Prestressing (FIB). (2001). “Externally bonded FRP reinforcement for RC structures.” International Federation for Structural Concrete, Bull. 14, Sprint-Digital-Druck, Stuttgart, Germany, 138.
Ito, A., Aoki, Y., and Hashimoto, S. (2002). “Accurate extraction and measurement of fine cracks from concrete block surface image.” Industrial Electronics Society, IEEE-2002 28th Annual Conf., 2202–2207.
Japan Society of Civil Engineers (JSCE). (2001). “Recommendations for upgrading of concrete structures with use of continuous fiber sheets.” Concr. Eng. Ser. Rep., Committee 292 on Concrete Structures with Externally Bonded Continuous Fiber Reinforcing Materials, Tokyo, 41.
Japan Society of Civil Engineers (JSCE). (2002). “Test method for tensile properties of continuous fiber sheets.”, Tokyo.
Japan Society of Civil Engineers (JSCE). (2007). “Standard specification for concrete structures - Structural performance verification - Design.”, Tokyo.
Jaqin, H., Nakai, H., Ueda, T., Sato, Y., and Dai, J. (2005). “Seismic retrofitting of RC piers using continuous fiber sheet with large fracturing strain.” J. Struct. Eng., 51A(2), 893–902.
Jirawattanasomkul, T., Ikoma, Y., Zhang, D., and Ueda, T. (2011). “Shear strength of reinforced concrete members strengthened with FRP jacketing.” Proc., Japan Concrete Institute, Japan Concrete Institute, 33(2), 991–996.
Karbhari, V. M., and Zhao, L. (2000). “Use of composites for 21st century civil infrastructure.” Comput. Meth. Appl. Mech. Eng., 185(2–4), 433–454.
Lechat, C., Bunsell, A. R., and Davies, P. (2011). “Tensile and creep behavior of polyethylene terephthalate and polyethylene naphthalate fibres.” J. Mater. Sci., 46(2), 528–533.
Maekawa, K., and An, X. (2000). “Shear failure and ductility of RC columns after yielding of main reinforcement.” Eng. Fracture Mech., 65(2–3), 335–368.
Massone, L. M., and Wallace, J. W. (2004). “Load-deformation responses of slender reinforced concrete walls.” ACI Struct. J., 101(1), 103–113.
Priestley, M. J. N. (2000). “Performance-based seismic design.” Proc., 12th World Conf. on Earthquake Eng., New Zealand Society for Earthquake Engineering, Upper Hutt, New Zealand, 1–22.
Priestley, M. J. N., Verma, R., and Xiao, Y. (1994). “Seismic shear strength of reinforced concrete columns.” J. Struct. Eng., 2310–2327.
Qi, C., Weiss, J., and Olek, J. (2003). “Characterization of plastic shrinkage cracking in fiber reinforced concrete using image analysis and a modified Weibull function.” Mater. Struct., 36(6), 386–395.
Sato, Y., Ueda, T., and Kakuta, Y. (1997). “Shear strength of reinforced and prestressed concrete beams with shear reinforcement.” Concrete Library Int. JSCE, No. 29, 233–247.
Seible, F., Priestley, M. J. N., Hegemier, G. A., and Innamorato, D. (1997). “Seismic retrofit of RC columns with continuous carbon fiber jackets.” J. Compos. Constr., 52–62.
Sezen, H., and Moehle, J. P. (2004). “Shear strength model for lightly reinforced concrete columns.” J. Struct. Eng., 1692–1703.
Sirbu, G., Ueda, T., and Kakuta, Y. (2001). “A study on shear resisting mechanism of RC columns strengthened with carbon fiber sheets.” J. Struct. Eng., 47A(3), 1289–1298.
Ueda, T., Sato, Y., Ito, T., and Nishizono, K. (2002). “Shear deformation of reinforced concrete beam.” J. Mater., Concrete Struc., Pavements, 711(56), 205–215.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 18 • Issue 3 • June 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 8, 2013
Accepted: Sep 17, 2013
Published online: Nov 19, 2013
Discussion open until: Apr 19, 2014
Published in print: Jun 1, 2014
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.