Effect of Load Path on Behavior of FRP-Confined Concrete
Publication: Journal of Composites for Construction
Volume 21, Issue 4
Abstract
This paper presents an experimental study on concrete cylinders confined by fiber-reinforced polymer (FRP) and loaded under constant axial load and increasing bending moment. A total of 55 cylinders were tested with FRP thickness and axial force ratio being the variables. Compared with another load path of constant load eccentricity and increasing axial load, the response of the cylinders under this loading scheme was very different. It is concluded that load path has a significant effect on the stress-strain behavior of FRP-confined concrete and different stress-strain models are required for FRP-confined concrete under different load paths. Based on the test results, a stress-strain model is proposed for FRP-confined concrete under the relevant load path.
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Acknowledgments
The work described in this paper was fully supported by a grant from the Hong Kong Construction Industry Council (Project No. CICR/09/13) and the National Natural Science Foundation of China (Grant No. 51378449). Undergraduate student Wong Hei Long took part in the experimental tests as a final year project. His significant contributions to the work are acknowledged.
References
ACI (American Concrete Institute). (1999). “Building code requirements for structural concrete and commentary.”, Farmington Hills, MI.
Albanesi, T., Nuti, C., and Vanzi, I. (2007). “Closed form constitutive relationship for concrete filled FRP tubes under compression.” Constr. Build. Mater., 21(2), 409–427.
ASTM. (1995). “Standard test method for tensile properties of polymer matrix composite materials.”, West Conshohocken, PA.
Bechtoula, H., Kono, S., and Watanabe, F. (2005). “Experimental and analytical investigations of seismic performance of cantilever reinforced concrete columns under varying transverse and axial loads.” J. Asian Archit. Build., 4(2), 467–474.
Bisby, L., and Ranger, M. (2010). “Axial-flexural interaction in circular FRP-confined reinforced concrete columns.” Constr. Build. Mater., 24(9), 1672–1681.
Bousias, S. N., Verzelleti, G., Fardis, M. N., and Magonette, G. (1992). “RC columns in cyclic biaxial bending and axial load.” Proc., 10th World Conf. on Earthquake Engineering, A.A. Balkema, Rotterdam, Netherlands, 3041–3046.
Cao, Y. G., Jiang, C., and Wu, Y. F. (2016). “Cross-sectional unification on the stress-strain model of concrete subjected to high passive confinement by fiber-reinforced polymer.” Polymers, 8(5), 186.
CEB-FIP (Euro-International Committee for Concrete-International Federation for Prestressing). (1993). CEB-FIP model code 1990, Thomas Telford, London.
Chaallal, O., and Shahawy, M. (2000). “Performance of fiber-reinforced polymer -wrapped reinforced concrete column under combined axial-flexural loading.” ACI Struct. J., 97(4), 659–668.
El-Maaddawy, T., and El-Dieb, A. S. (2011). “Near-surface-mounted composite system for repair and strengthening of reinforced concrete columns subjected to axial load and biaxial bending.” J. Compos. Constr., 602–614.
Fam, A., Flisak, B., and Rizkalla, S. (2003). “Experimental and analytical modeling of concrete-filled fiber-reinforced polymer tubes subjected to combined bending and axial loads.” ACI Struct. J., 100(4), 499–509.
Fardis, M. N., and Khalili, H. H. (1982). “FRP-encased concrete as a structural material.” Mag. Concr. Res., 34(121), 191–202.
Hadi, M., and Widiarsa, I. (2012). “Axial and flexural performance of square RC columns wrapped with CFRP under eccentric loading.” J. Compos. Constr., 640–649.
Hadi, M. N. (2007). “Behaviour of FRP strengthened concrete columns under eccentric compression loading.” Compos. Struct., 77(1), 92–96.
Harajli, M. H. (2006). “Axial stress-strain relationship for FRP confined circular and rectangular concrete columns.” Cem. Concr. Compos., 28(10), 938–948.
Hu, B., Wang, J. G., and Li, G. Q. (2011). “Numerical simulation and strength models of FRP-wrapped reinforced concrete columns under eccentric loading.” Constr. Build. Mater., 25(5), 2751–2763.
Ilki, A., Kumbasar, N., and Koc, V. (2004). “Low strength concrete members externally confined with FRP sheets.” Struct. Eng. Mech., 18(2), 167–194.
Jiang, C., Wu, Y., and Wu, G. (2014). “Plastic hinge length of FRP-confined square RC columns.” J. Compos. Constr., .
Jiang, T., and Teng, J. G. (2007). “Analysis-oriented stress-strain models for FRP-confined concrete.” Eng. Struct., 29(11), 2968–2986.
Kono, S., Inazumi, M., and Kaku, T. (1998). “Evaluation of confining effects of CFRP sheets on reinforced concrete members.” 2nd Int. Conf. on Composites in Infrastructure, Dept. of Civil Engineering and Engineering Mechanics, Tucson, AZ.
Kwan, A. K. H., Dong, C. X., and Ho, J. C. M. (2015). “Axial and lateral stress-strain model for FRP confined concrete.” Eng. Struct., 99, 285–295.
Lam, L., and Teng, J. G. (2003). “Design-oriented stress-strain model for FRP-confined concrete.” Constr. Build. Mater., 17(6), 471–489.
Li, J., and Hadi, M. (2003). “Behaviour of externally confined high-strength concrete columns under eccentric loading.” Compos. Struct., 62(2), 145–153.
Li, K. N., Aoyama, H., and Otani, S. (1988). “Reinforced concrete columns under varying axial load and bi-directional lateral load reversals.” Proc., 9th World Conf. on Earthquake Engineering, Tokyo, 537–542.
Lim, J. C., and Ozbakkaloglu, T. (2015). “Hoop strains in FRP-confined concrete columns: Experimental observations.” Mater. Struct., 48(9), 2839–2854.
Marques, S., Marques, D., Lins da Silva, J., and Cavalcante, M. (2004). “Model for analysis of short columns of concrete confined by fiber-reinforced polymer.” J. Compos. Constr., 332–340.
Mirmiran, A., and Shahawy, M. (1997). “Behavior of concrete columns confined by fiber composites.” J. Struct. Eng., 583–590.
Parvin, A., and Wang, W. (2001). “Behavior of FRP jacketed concrete columns under eccentric loading.” J. Compos. Constr., 146–152.
Pham, T. M., Doan, L. V., and Hadi, M. N. (2013). “Strengthening square reinforced concrete columns by circularisation and FRP confinement.” Constr. Build. Mater., 49, 490–499.
Popovics, S. (1973). “A numerical approach to the complete stress-strain curve of concrete.” Cem. Concr. Res., 3(5), 583–599.
Qiu, F., Li, W., Pan, P., and Qian, J. (2002). “Experimental tests on reinforced concrete columns under biaxial quasi-static loading.” Eng. Struct., 24(4), 419–428.
Rodrigues, H., Furtado, A., and Arêde, A. (2015). “Behavior of rectangular reinforced-concrete columns under biaxial cyclic loading and variable axial loads.” J. Struct. Eng., https://doi.org/10.1061/(ASCE)ST.1943-541X.0001345, .
Saafi, M., Toutanji, H., and Li, Z. (1999). “Behavior of concrete columns confined with fiber reinforced polymer tubes.” ACI Mater. J., 96(4), 500–509.
Samaan, M., Mirmiran, A., and Shahawy, M. (1998). “Model of concrete confined by fiber composites.” J. Struct. Eng., 1025–1031.
Shehata, I. A., Carneiro, L. A., and Shehata, L. C. (2002). “Strength of short concrete columns confined with CFRP sheets.” Mater. Struct., 35(1), 50–58.
Song, X., Gu, X., Li, Y., Chen, T., and Zhang, W. (2012). “Mechanical behavior of FRP-strengthened concrete columns subjected to concentric and eccentric compression loading.” J. Compos. Constr., https://doi.org/10.1061/(ASCE)CC.1943-5614.0000351, 336–346.
Teng, J., Huang, Y., Lam, L., and Ye, L. (2007). “Theoretical model for fiber-reinforced polymer-confined concrete.” J. Compos. Constr., 201–210.
Trapko, T. (2014). “Behaviour of fibre reinforced cementitious matrix strengthened concrete columns under eccentric compression loading.” Mater. Design., 54, 947–954.
Wang, W., Sheikh, M., and Hadi, M. (2016). “Experimental study on FRP tube reinforced concrete columns under different loading conditions.” J. Compos. Constr., .
Wei, Y. Y., and Wu, Y. F. (2012). “Unified stress-strain model of concrete for FRP-confined columns.” Constr. Build. Mater., 26(1), 381–392.
Wu, Y., Yun, Y., Wei, Y., and Zhou, Y. (2014). “Effect of predamage on the stress-strain relationship of confined concrete under monotonic loading.” J. Struct. Eng., .
Wu, Y. F., He, L., and Bank, L. (2015). “Bond-test protocol for plate-to-concrete interface involving all mechanisms.” J. Compos. Constr., .
Wu, Y. F., and Jiang, C. (2013a). “Effect of load eccentricity on the stress-strain relationship of FRP-confined concrete columns.” Compos. Struct., 98, 228–241.
Wu, Y. F., and Jiang, C. (2013b). “Quantification of bond-slip relationship for externally bonded FRP-to-concrete joints.” J. Compos. Constr., 673–686.
Wu, Y. F., and Jiang, J. F. (2013c). “Effective strain of FRP for confined circular concrete columns.” Compos. Struct., 95, 479–491.
Wu, Y. F., Liu, T., and Oehlers, D. (2006). “Fundamental principles that govern retrofitting of reinforced concrete columns by steel and FRP jacketing.” Adv. Struct. Eng., 9(4), 507–533.
Wu, Y. F., and Wang, L. (2009). “Unified strength model for square and circular concrete columns confined by external jacket.” J. Struct. Eng., 253–261.
Wu, Y. F., and Zhou, Y. W. (2010). “Unified strength model based on Hoek-Brown failure criterion for circular and square concrete columns confined by FRP.” J. Compos. Constr., 175–184.
Xiao, Y., and Wu, H. (2000). “Compressive behavior of concrete confined by carbon fiber composite jackets.” J. Mater. Civ. Eng., 139–146.
Xiao, Y., and Wu, H. (2003). “Compressive behavior of concrete confined by various types of FRP composite jackets.” J. Reinf. Plast. Comp., 22(13), 1187–1201.
Youssef, M. N., Feng, M. Q., and Mosallam, A. S. (2007). “Stress-strain model for concrete confined by FRP composites.” Compos. Part B Eng., 38(5), 614–628.
Yu, T., Wong, Y. L., and Teng, J. G. (2010). “Behavior of hybrid FRP-concrete-steel double-skin tubular columns subjected to eccentric compression.” Adv. Struct. Eng., 13(5), 961–974.
Yun, Y., and Wu, Y. F. (2011). “Durability of CFRP-concrete joints under freeze-thaw cycling.” Cold Reg. Sci. Technol., 65(3), 401–412.
Zhang, H. Q. (2014). “Experimental study of stress-strain behavior of FRP-confined concrete subjected to eccentric compression.” Master thesis, Zhejiang Univ., Hangzhou, China (in Chinese).
Zhou, Y. W., and Wu, Y. F. (2012). “General model for constitutive relationships of concrete and its composite structures.” Compos. Struct., 94(2), 580–592.
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Published In
Journal of Composites for Construction
Volume 21 • Issue 4 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 11, 2016
Accepted: Dec 5, 2016
Published online: Feb 15, 2017
Discussion open until: Jul 15, 2017
Published in print: Aug 1, 2017
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