Nonlinear Finite Element Modeling of Different Cross-Sectional Shapes of Slender RC Columns Confined with CFRP Wraps

Document Type : Regular Paper


University of Kurdistan


In the present study, nonlinear finite element analysis is carried out on the slender reinforced concrete columns wrapped using CFRP composite with different cross-sectional shapes having the same area. Thickness of the CFRP wraps, concrete compressive strength, corner radius, loading condition, slenderness ratio and column size are the main parameters of this study. According to this, four different eccentricity-to-section-height ratios, four different levels of the CFRP thickness in the strengthened specimens, the slenderness ratios of the length to the section-height (l/h) from 6 to 12, three various types of column size, concrete compressive strength values from 20 to 50 MPa and corner radiuses from 10 to 40 mm are considered. This paper presents a comparison of a numerical simulation using ABAQUS software, with the results of experimental tests by previous researchers to validate finite element models. It is shown that the predicted results by this numerical study are in reasonable agreement with the results of experimental studies. The results of this investigation also represented a considerable enhancement on the performance of strengthened columns with CFRP compared to unstrengthened columns.


Main Subjects

[1] Mirmiran, A., Shahawy, M., Samaan, M., Echary, H. E., Mastrapa, J. C., & Pico, O. (1998). Effect of column parameters on FRP-confined concrete. Journal of Composites for Construction, 2(4), 175-185.
[2] Rochette, P., & Labossiere, P. (2000). Axial testing of rectangular column models confined with composites. Journal of Composites for Construction, 4(3), 129-136.
[3] Wu, Y. F., Liu, T., & Oehlers, D. J. (2006). Fundamental principles that govern retrofitting of reinforced concrete columns by steel and FRP jacketing. Advances in Structural Engineering, 9(4), 507-533.
[4] Smith, S. T., Kim, S. J., & Zhang, H. (2010). Behavior and effectiveness of FRP wrap in the confinement of large concrete cylinders. Journal of Composites for Construction, 14(5), 573-582.
[5] Parvin, A., & Wang, W. (2001). Behavior of FRP jacketed concrete columns under eccentric loading. Journal of Composites for Construction, 5(3), 146-152.
[6] Li, J., & Hadi, M. N. S. (2003). Behaviour of externally confined high-strength concrete columns under eccentric loading. Composite Structures, 62(2), 145-153.
[7] Hadi, M. N. S., & Li, J. (2004). External reinforcement of high strength concrete columns. Composite Structures, 65(3), 279-287.
[8] Hadi, M. N. S. (2006). Behaviour of FRP wrapped normal strength concrete columns under eccentric loading. Composite Structures, 72(4), 503-511.
[9] Hadi, M. N. (2006). Comparative study of eccentrically loaded FRP wrapped columns. Composite Structures, 74(2), 127-135.
[10] Hadi, M. N. (2007). Behaviour of FRP strengthened concrete columns under eccentric compression loading. Composite Structures, 77(1), 92-96.
[11] Hadi, M. N. (2007). The behaviour of FRP wrapped HSC columns under different eccentric loads. Composite Structures, 78(4), 560-566.
[12] Barros, J. A., Varma, R. K., Sena-Cruz, J. M., & Azevedo, A. F. (2008). Near surface mounted CFRP strips for the flexural strengthening of RC columns: Experimental and numerical research. Engineering Structures, 30(12), 3412-3425.
[13] Saadatmanesh, H., Ehsani, M. R., & Li, M. W. (1994). Strength and ductility of concrete columns externally reinforced with fiber composite straps. ACI Structural journal, 91(4), 434-447.
[14] Malik, A. R., & Foster, S. J. (2010). Carbon fiber-reinforced polymer confined reactive powder concrete columns-experimental investigation. ACI Structural Journal, 107(3), 263.
[15] Zhong Tao, J. G., & Lin-Hai Han, L. (2004). Experimental behaviour of FRP-confined slender RC columns under eccentric loading. In Advanced Polymer Composites for Structural Applications in Construction: ACIC 2004: Proceedings of the Second International Conference, Held at the University of Surrey, Guildford, UK on 20-22 April 2004 (p. 203). Woodhead Publishing.
[16] Bisby, L., & Ranger, M. (2010). Axial–flexural interaction in circular FRP-confined reinforced concrete columns. Construction and Building Materials, 24(9), 1672-1681.
[17] Toutanji, H., & Deng, Y. (2002). Strength and durability performance of concrete axially loaded members confined with AFRP composite sheets. Composites Part B: Engineering, 33(4), 255-261.
[18] Teng, J. G., & Lam, L. (2002). Compressive behavior of carbon fiber reinforced polymer-confined concrete in elliptical columns. Journal of Structural Engineering, 128(12), 1535-1543.
[19] Al-Kamaki, Y. S., Al-Mahaidi, R., & Bennetts, I. (2015). Experimental and numerical study of the behaviour of heat-damaged RC circular columns confined with CFRP fabric. Composite Structures, 133, 679-690.
[20] Mirmiran, A., Zagers, K., & Yuan, W. (2000). Nonlinear finite element modeling of concrete confined by fiber composites. Finite Elements in Analysis and Design, 35(1), 79-96.
[21] Drucker, D. C., & Prager, W. (1952). Soil mechanics and plastic analysis or limit design. Quarterly of applied mathematics, 10(2), 157-165.
[22] Kabir, M. Z., & Shafei, E. (2012). Plasticity modeling of FRP-confined circular reinforced concrete columns subjected to eccentric axial loading. Composites Part B: Engineering, 43(8), 3497-3506.
[23] Manual, A. S. U. S. (2014). The Abaqus Software is a product of Dassault Systèmes Simulia Corp. Providence, RI, USA Dassault Systèmes, Version, 6.
[24] Lam, L., & Teng, J. G. (2003). Design-oriented stress–strain model for FRP-confined concrete. Construction and building materials, 17(6), 471-489.
[25] Kent, D. C., & Park, R. (1971). Flexural members with confined concrete. Journal of the Structural Division.
[26] SikaWrap Hex 230C. (2005). Carbon fiber fabric for structural strengthening system product data sheet, Sika, Edition 04.
[27] El Maaddawy, T., El Sayed, M., & Abdel-Magid, B. (2010). The effects of cross-sectional shape and loading condition on performance of reinforced concrete members confined with carbon fiber-reinforced polymers. Materials & Design, 31(5), 2330-2341.
[28] Wang, L. M., & Wu, Y. F. (2008). Effect of corner radius on the performance of CFRP-confined square concrete columns: Test. Engineering structures, 30(2), 493-505.