Predicting Stress and Strain of FRP-Confined Square/Rectangular Columns Using Artificial Neural Networks
Publication: Journal of Composites for Construction
Volume 18, Issue 6
Abstract
This study proposes the use of artificial neural networks (ANNs) to calculate the compressive strength and strain of fiber reinforced polymer (FRP)–confined square/rectangular columns. Modeling results have shown that the two proposed ANN models fit the testing data very well. Specifically, the average absolute errors of the two proposed models are less than 5%. The ANNs were trained, validated, and tested on two databases. The first database contains the experimental compressive strength results of 104 FRP confined rectangular concrete columns. The second database consists of the experimental compressive strain of 69 FRP confined square concrete columns. Furthermore, this study proposes a new potential approach to generate a user-friendly equation from a trained ANN model. The proposed equations estimate the compressive strength/strain with small error. As such, the equations could be easily used in engineering design instead of the invisible processes inside the ANN.
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Acknowledgments
The first author would like to acknowledge the Vietnamese Government and the University of Wollongong for the support of his full Ph.D. scholarship. Both authors also thank Dr. Duc Thanh Nguyen, Research Associate—University of Wollongong, for his advice about ANN.
References
ACI 440.2R-08. (2008). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” 440.2R-08, Farmington Hills, MI.
Adeli, H., and Park, H. S. (1995). “Counterpropagation neural networks in structural engineering.” J. Struct. Eng., 1205–1212.
Bisby, L. A., Dent, A. J. S., and Green, M. F. (2005). “Comparison of confinement models for fiber-reinforced polymer-wrapped concrete.” ACI Struct. J., 102(1), 62–72.
Chen, H. M., Tsai, K. H., Qi, G. Z., Yang, J. C. S., and Amini, F. (1995). “Neural-network for structural control.” J. Comput. Civ. Eng., 168–176.
Elkordy, M. F., Chang, K. C., and Lee, G. C. (1993). “Neural networks trained by analytically simulated damage states.” J. Comput. Civ. Eng., 130–145.
Flood, I., and Kartam, N. (1994). “Neural networks in civil engineering. I: Principles and understanding.” J. Comput. Civ. Eng., 131–148.
Hadi, M. N. S. (2003). “Neural networks applications in concrete structures.” Comput. Struct., 81(6), 373–381.
Hadi, M. N. S. (2006a). “Behaviour of FRP wrapped normal strength concrete columns under eccentric loading.” Compos. Struct., 72(4), 503–511.
Hadi, M. N. S. (2006b). “Comparative study of eccentrically loaded FRP wrapped columns.” Compos. Struct., 74(2), 127–135.
Hadi, M. N. S. (2007a). “Behaviour of FRP strengthened concrete columns under eccentric compression loading.” Compos. Struct., 77(1), 92–96.
Hadi, M. N. S. (2007b). “The behaviour of FRP wrapped HSC columns under different eccentric loads.” Compos. Struct., 78(4), 560–566.
Hadi, M. N. S. (2009). “Behaviour of eccentric loading of FRP confined fibre steel reinforced concrete columns.” Constr. Build. Mater., 23(2), 1102–1108.
Hadi, M. N. S., and Li, J. (2004). “External reinforcement of high strength concrete columns.” Compos. Struct., 65(3–4), 279–287.
Hadi, M. N. S., Pham, T. M., and Lei, X. (2013). “New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps.” J. Compos. Constr., 229–238.
Hadi, M. N. S., and Widiarsa, I. B. R. (2012). “Axial and flexural performance of square RC columns wrapped with CFRP under eccentric loading.” J. Compos. Constr., 640–649.
Hajela, P., and Berke, L. (1991). “Neurobiological computational models in structural analysis and design.” Comput. Struct., 41(4), 657–667.
Hornik, K., Stinchcombe, M., and White, H. (1989). “Multilayer feedforward networks are universal approximators.” Neural Networks, 2(5), 359–366.
Ilki, A., Peker, O., Karamuk, E., Demir, C., and Kumbasar, N. (2008). “FRP retrofit of low and medium strength circular and rectangular reinforced concrete columns.” J. Mater. Civ. Eng., 169–188.
Jalal, M., and Ramezanianpour, A. A. (2012). “Strength enhancement modeling of concrete cylinders confined with CFRP composites using artificial neural networks.” Compos. Part B Eng., 43(8), 2990–3000.
Kim, Y. Y., et al. (2006). “Dynamic analysis and structural optimization of a fiber optic sensor using neural networks.” J. Mech. Sci. Technol., 20(2), 251–261.
Lam, L., and Teng, J. G. (2003a). “Design-oriented stress-strain model for FRP-confined concrete.” Constr. Build. Mater., 17(6–7), 471–489.
Lam, L., and Teng, J. G. (2003b). “Design-oriented stress-strain model for FRP-confined concrete in rectangular columns.” J. Reinf. Plast. Compos., 22(13), 1149–1186.
Masri, S. F., Chassiakos, A. G., and Caughey, T. K. (1992). “Structure-unknown non-linear dynamic systems: Identification through neural networks.” Smart Mater. Struct., 1(1), 45.
MATLAB R2012b. [Computer software]. The Math Works, Natick, MA.
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., 175–185.
Naderpour, H., Kheyroddin, A., and Amiri, G. G. (2010). “Prediction of FRP-confined compressive strength of concrete using artificial neural networks.” Compos. Struct., 92(12), 2817–2829.
Ozbakkaloglu, T., Lim, J. C., and Vincent, T. (2013). “FRP-confined concrete in circular sections: Review and assessment of stress–strain models.” Eng. Struct., 49, 1068–1088.
Perera, R., Arteaga, A., and Diego, A. D. (2010a). “Artificial intelligence techniques for prediction of the capacity of RC beams strengthened in shear with external FRP reinforcement.” Compos. Struct., 92(5), 1169–1175.
Perera, R., Barchín, M., Arteaga, A., and Diego, A. D. (2010b). “Prediction of the ultimate strength of reinforced concrete beams FRP-strengthened in shear using neural networks.” Compos. Part B Eng., 41(4), 287–298.
Pham, T. M., Doan, L. V., and Hadi, M. N. S. (2013). “Strengthening square reinforced concrete columns by circularisation and FRP confinement.” Constr. Build. Mater., 49, 490–499.
Pham, T. M., and Hadi, M. N. S. (2013). “Strain estimation of CFRP confined concrete columns using energy approach.” J. Compos. Constr., 04013001-1–04013001-11.
Pham, T. M., and Hadi, M. N. S. (2014). “Stress prediction model for FRP confined rectangular concrete columns with rounded corners.” J. Compos. Constr., 04013019-1–04013019-10.
Rousakis, T., Rakitzis, T., and Karabinis, A. (2012). “Design-oriented strength model for FRP-confined concrete members.” J. Compos. Constr., 615–625.
Rousakis, T. C., Karabinis, A. I., and Kiousis, P. D. (2007). “FRP-confined concrete members: Axial compression experiments and plasticity modelling.” Eng. Struct., 29(7), 1343–1353.
Shehata, I. A. E. M., Carneiro, L. A. V., and Shehata, L. C. D. (2002). “Strength of short concrete columns confined with CFRP sheets.” Mater. Struct., 35(1), 50–58.
Tasdemir, M. A., Tasdemir, C., Akyüz, S., Jefferson, A. D., Lydon, F. D., and Barr, B. I. G. (1998). “Evaluation of strains at peak stresses in concrete: A three-phase composite model approach.” Cem. Concr. Compos., 20(4), 301–318.
Toutanji, H., Han, M., Gilbert, J., and Matthys, S. (2010). “Behavior of large-scale rectangular columns confined with FRP composites.” J. Compos. Constr., 62–71.
Upadhyaya, B. R., and Eryurek, E. (1992). “Application of neural networks for sensor validation and plant monitoring.” Nuclear Technol., 97(2), 170–176.
Wu, X., Ghaboussi, J., and Garrett, J. H. (1992). “Use of neural networks in detection of structural damage.” Comput. Struct., 42(4), 649–659.
Wu, Y. F., and Wang, L. M. (2009). “Unified strength model for square and circular concrete columns confined by external jacket.” J. Struct. Eng., 253–261.
Wu, Y. F., and Wei, Y. Y. (2010). “Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns.” Eng. Struct., 32(1), 32–45.
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.
Yazici, V., and Hadi, M. N. S. (2012). “Normalized confinement stiffness approach for modeling FRP-confined concrete.” J. Compos. Constr., 520–528.
Information & Authors
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Published In
Journal of Composites for Construction
Volume 18 • Issue 6 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 14, 2013
Accepted: Feb 3, 2014
Published online: Mar 13, 2014
Discussion open until: Aug 13, 2014
Published in print: Dec 1, 2014
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