Hybrid Confinement of Concrete by Fiber-Reinforced Polymer Sheets and Fiber Ropes under Cyclic Axial Compressive Loading
Publication: Journal of Composites for Construction
Volume 17, Issue 5
Abstract
This study looks into the mechanical behavior of concrete lightly confined by fiber-reinforced polymer (FRP) sheets made with glass fibers and by polypropylene fiber ropes (PPFRs). PPFRs have ultrahigh deformation at failure. The hybrid confining technique suggests applying the fiber rope on already cured FRP jackets as external unbonded reinforcement. No impregnation or gluing resins are necessary for the fiber rope (FR) application. The technique uses mechanical anchorage for the ends of the FR. Sixteen confined standard concrete cylinders, in two series and with different concrete qualities, were tested under repeated axial compression cycles of increasing displacement. They included confinement of one layer of glass FRP and FR confinement in different volumetric ratios. The investigation also compares columns confined only by glass fiber–reinforced polymer (GFRP) jackets or only by PPFR wrapping. The elaboration evaluates the axial stress versus axial and lateral strain behavior of the columns. Proper design of the hybrid confinement utilizes further the confining effects of the FRP sheet up to its multiple fracture. Then, FR ensures increased axial strain (higher than 5%) and dissipated energy of concrete. The load presents a temporary yet controlled loss, followed by an increase for further loading.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The author would like to acknowledge the contribution of Zarras S.A. for providing concrete; Sintecno S.A. for providing glass sheets and epoxy resins; and Thrace Plastics Co. S.A. for providing the polypropylene fiber ropes. Also, thanks are owed to undergraduate students Pekas E., Dimitriadou T., Anezakis M., and Gouma M. for their help in the experimental program and to the DUTh RC lab staff.
References
American Concrete Institute (ACI). (2008). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.”, Detroit, 76.
Anggawidjaja, D., Ueda, T., Dai, J., and Nakai, H. (2006). “Deformation capacity of RC piers by new fiber-reinforced polymer with large fracture strain.” Cem. Concr. Compos., 28(10), 914–927.
Bournas, B. A., Lontou, P. V., Papanicolaou, C. G., and Triantafillou, T. C. (2007). “Textile- reinforced mortar (TRM) versus FRP confinement in reinforced concrete columns.” ACI Struct. J., 104(6), 740–748.
Chen, J. F., Li, S. Q., Bisby, L. A., and Ai, J. (2011). “FRP rupture strains in the split-disk test.” Compos. Part B, 42(4), 962–972.
Dai, J., Bai, Y., and Teng, J. G. (2011). “Behavior and modeling of concrete confined with FRP composites of large deformability.” J. Compos. Constr., 15(6), 963–973.
De Caso y Basalo, F., Matta, F., and Nanni, A. (2011). “Novel test method for ultimate hoop-strain characterization in FRP jackets.” J. Mater. Civ. Eng., 23(12), 1633–1641.
De Caso y Basalo, F., Matta, F., and Nanni, A. (2012). “Fiber reinforced cement-based composite system for concrete confinement.” Constr. Build. Mater., 32, 55–65.
De Lorenzis, L., and Tepfers, R. (2003). “Comparative study of models on confinement of concrete cylinders with fiber-reinforced polymer composites.” J. Compos. Constr., 7(3), 219–234.
Fardis, M. N., and Khalili, H. (1981). “Concrete encased in fibreglass-reinforced- plastic.” Proc.—Am. Concr. Inst., 78(6), 440–446.
Hu, Y. M., Yu, T., and Teng, J. G. (2011). “FRP-confined circular concrete-filled thin steel tubes under axial compression.” J. Compos. Constr., 15(5), 850–860.
Karabinis, A. I., and Rousakis, T. C. (2002). “Concrete confined by FRP material: A plasticity approach.” Eng. Struct. J., 24(7), 923–932.
Liang, M., Wu, Z., Ueda, T., Zheng, J., and Akogbe, R. (2012). “Experiment and modeling on axial behavior of carbon fiber reinforced polymer confined concrete cylinders with different sizes.” J. Reinf. Plast. Compos., 31(6), 389–403.
Matthys, S., Toutanji, H., and Taerwe, L. (2006). “Stress-strain behavior of large-scale circular columns confined with FRP composites.” J. Struct. Eng., 132(1), 123–133.
Mirmiran, A., Shahawy, M., Samaan, M., El Echary, H., Mastrapa, J. C., Pico, O. (1998). “Effect of columns parameters on FRP-confined concrete.” J. Compos. Constr., 2(4), 175–185.
National Research Council (CNR), Advisory Committee on Technical Recommendations for Construction. (2004). “Guide for the design and construction of externally bonded FRP systems for strengthening existing structures.”, Rome.
Peled, A. (2007). “Confinement of damaged and nondamaged structural concrete with FRP and TRC sleeves.” J. Compos. Constr., 11(5), 514–522.
Rousakis, T. C. (2001). “Experimental investigation of concrete cylinders confined by carbon FRP sheets, under monotonic and cyclic axial compressive load.” Research Rep., Chalmers Univ. of Technology, Göteborg, Sweden.
Rousakis, T. (2013). “Elastic fiber ropes of ultra high extension capacity in strengthening of concrete through confinement.” J. Mater. Civ. Eng.
Rousakis, T. C., and Karabinis, A. I. (2008). “Substandard reinforced concrete members subjected to compression—FRP confining effects.” Mater. Struct., 41(9), 1595–1611.
Rousakis, T. C., and Karabinis, A. I. (2012). “Adequately FRP confined reinforced concrete columns under axial compressive monotonic or cyclic loading.” Mater. Struct., 45(7), 957–975.
Rousakis, T. C., Karabinis, A. I., Kiousis, P. D., and Tepfers, R. (2008). “Analytical modeling of plastic behaviour of uniformly FRP confined concrete members.” Composites, Part B, 39(7–8), 1104–1113.
Rousakis, T. C., Rakitzis, T. D., and Karabinis, A. I. (2012a). “Design-oriented strength model for FRP confined concrete members.” Compos. Constr., 16(6), 615–625.
Rousakis, T. C., Rakitzis, T. D., and Karabinis, A. I. (2012b). “Empirical modeling of failure strains of uniformly FRP confined concrete columns.” The 6th Int. Conf. on FRP Composites in Civil Engineering—CICE 2012, Int. Institute for FRP in Construction, Rome.
Scherer, J. (1999). “S&P-Sintecno, FRP-polymer fibers in strengthening.” User guide, Brunnen.
Shimomura, T., and Phong, N. H. (2007). “Structural performance of concrete members reinforced with continuous fiber rope.” 8th Int. Symp. on Fiber Reinforced Polymer Reinforcement for Concrete Structures (FRPRCS-8), Univ. of Patras, Patras, Greece.
Shin, M., and Andrawes, B. (2011). “Lateral cyclic behavior of reinforced concrete columns retrofitted with shape memory spirals and FRP wraps.” J. Struct. Eng., 137(11), 1282–1290.
Tamuzs, V., et al. (2006). “Behavior of concrete cylinders confined by carbon-composite tapes and prestressed yarns.” Mech. Compos. Mater., 42(1), 13–32.
Teng, J. G., Jiang, T., Lam, L., and Luo, Y. Z. (2009). “Refinement of a design-oriented stress-strain model for FRP-confined concrete.” J. Compos. Constr., 13(4), 269–278.
Triantafillou, T. C., and Papanicolaou, C. G. (2005). “Textile reinforced mortars (TRM) versus fiber reinforced polymers (FRP) as strengthening materials of concrete structures.” Seventh Int. Symp. on FRP Reinforcement for Reinforced Concrete Structures (FRPRCS-7), SP230-6, American Concrete Institute, Kansas City, MO, 99–118.
Wie, Y., and Wu, Y. (2012). “Unified stress-strain model of concrete for FRP-confined columns.” Constr. Build. Mater., 26(1), 381–392.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 17 • Issue 5 • October 2013
Pages: 732 - 743
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 27, 2012
Accepted: Mar 15, 2013
Published online: Mar 18, 2013
Discussion open until: Aug 18, 2013
Published in print: Oct 1, 2013
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.