Numerical Analysis of Retrofitted RC Column under Lateral Load

Document Type : Original Article


1 Assistant Professor, Department of Civil Engineering, Ahsanullah University of Science and Technology, Dhaka-1208, Bangladesh

2 Structural Engineer, Environment and Infrastructure Management Solution (EIMS) Limited, Dhaka- 1215, Bangladesh

3 Professor, Department of Civil Engineering, Ahsanullah University of Science and Technology, Dhaka-1208, Bangladesh


One of the most common retrofitting processes for columns is reinforced concrete (RC) jacketing. This process enhances the ductility, stiffness, flexural capacity, and shear capacity of columns, and increases the axial load-carrying capacity of the RC column when subjected to an axial load. According to previous research, the most typical way to improve the lateral capacity of a column in composite action is column retrofitting with RC jacketing. The lateral strength of a single RC column and a single bay, single-story RC frame (retrofitted with concrete jacketing) is numerically analyzed in this work. To obtain a complete overview, an RC frame analysis is conducted even though a single column represents the column in the frame. Finally, parametric analysis is performed to assess the influence of reinforcement ratio, compressive strength of jacket concrete, and yield strength of reinforcement. The axial load carrying capacity and flexural capacity of retrofitted columns increase with the increase in RC jacket compressive strength, reinforcement percentage, and yield strength of the reinforcement. If the compressive strength of the jacket concrete stays constant, 1% reinforcement increment leads to a 10% to 20% increase in the axial capacity of the column. The parametric study reveals that retrofitted columns and frames exhibit a substantial increase in lateral capacity (10 to 12 times) compared to existing columns.


  • RC jacketing of columns improves axial and flexural capacity significantly.
  • Numerical analysis reveals that Initial stiffness and lateral capacity of retrofitted column influenced by the reinforcement ratio, compressive strength of jacket concrete, and yield strength of reinforcement.
  • RC jacketing is a reliable method to enhance the structural performance of columns and frames.


Main Subjects

[1]     Dritsos SE. Seismic strengthening of columns by adding new concrete. Bull New Zeal Soc Earthq Eng 2007;40:49–68.
[2]     Onyelowe KC, Jayabalan J, Ebid AM, Samui P, Singh RP, Soleymani A, et al. Evaluation of the Compressive Strength of CFRP-Wrapped Circular Concrete Columns Using Artificial Intelligence Techniques. Designs 2022;6:112.
[3]     Opabola EA, Elwood KJ, Liel AB. Evaluation of seismic performance of as-built and retrofitted reinforced concrete frame structures with LAP splice deficiencies. Earthq Eng Struct Dyn 2021;50:3138–59.
[4]     Isleem HF, Tayeh BA, Alaloul WS, Musarat MA, Raza A. Artificial Neural Network (ANN) and Finite Element (FEM) Models for GFRP-Reinforced Concrete Columns under Axial Compression. Materials (Basel) 2021;14:7172.
[5]     Jahangir H, Nikkhah Z, Rezazadeh Eidgahee D, Esfahani MR. Performance Based Review and Fine-Tuning of TRM-Concrete Bond Strength Existing Models. J Soft Comput Civ Eng 2023;7:43–55.
[6]     Naseri Nasab M, Jahangir H, Hasani H, Majidi MH, Khorashadizadeh S. Estimating the punching shear capacities of concrete slabs reinforced by steel and FRP rebars with ANN-Based GUI toolbox. Structures 2023;50:1204–21.
[7]     Xu T, Liu J, Wang X, Guo Y, Chen YF. Behaviour of short CFRP-steel composite tubed reinforced normal and high strength concrete columns under eccentric compression. Eng Struct 2020;205:110096.
[8]     Al-Mekhlafi GM, Al-Osta MA, Sharif AM. Behavior of eccentrically loaded concrete-filled stainless steel tubular stub columns confined by CFRP composites. Eng Struct 2020;205:110113.
[9]     Ersoy U, Tankut AT, Suleiman R. Behaviour of Jacketed Columns. ACI Struct J 1993;90:288–93.
[10]   Fukuyama K, Higashibata Y, Miyauchi Y. Studies on repair and strengthening methods of damaged reinforced concrete columns. Cem Concr Compos 2000;22:81–8.
[11]   Rodriguez M, Park R. Repair and Strengthening of Reinforced Concrete Buildings for Seismic Resistance. Earthq Spectra, EERI 1991;7:439–59.
[12]   Hakuto S. Retrofitting of Reinforced Concrete Moment Resisting Frames. University of Canterbury, New Zealand, 1995.
[13]   Bett BJ, Klinger RE, Jirsa JO. Lateral Load Response of Strengthened and Repair Reinforced Concrete Columns. ACI Struct J 1988;85:499–508.
[14]   Júlio ENBS, Branco FAB, Silva VD. Reinforced concrete jacketing - Interface influence on cyclic loading response. ACI Struct J 2005;102:252–7.
[15]   Júlio ES, Branco F, Silva VD. Structural rehabilitation of columns with reinforced concrete jacketing. Prog Struct Eng Mater 2003;5:29–37.
[16]   Sezen H, Miller EA. Experimental Evaluation of Axial Behavior of Strengthened Circular Reinforced-Concrete Columns. J Bridg Eng 2011;16:238–47.
[17]   Achillopoulou D V., Tasiopoulos TPK, Karabinis AI. Study of the behavior of RC columns strengthened with RC jackets containing dowels and different confinement ratios. ECCOMAS Themat Conf - COMPDYN 2013 4th Int Conf Comput Methods Struct Dyn Earthq Eng Proc - An IACM Spec Interes Conf 2013:4018–28.
[18]   Achillopoulou D, Pardalakis T, Karabinis A. Interface Capacity of Repaired Concrete Columns Strengthened with RC Jackets. Trans VŠB – Tech Univ Ostrava, Civ Eng Ser 2014;14:129–45.
[19]   Tayeh BA, Naja MA, Shihada S, Arafa M. Repairing and strengthening of damaged RC columns using thin concrete jacketing. Adv Civ Eng 2019;2019.
[20]   Anand P, Sinha AK. Effect of reinforced concrete jacketing on axial load capacity of reinforced concrete column. Civ Eng J 2020;6:1266–72.
[21]   Mazzoni S, McKenna F, Scott MH, Fenves GL. Open system for earthquake engineering simulation user command-language manual. Pacific Earthq Eng Res Center, Univ California, Berkeley, CA, USA 2009.
[22]   Zaiter A, Lau TL. Review on Strengthening Reinforced Concrete Columns Using Reinforced Concrete Jackets. IOP Conf Ser Earth Environ Sci 2020;614.
[23]   Caglar N, Sichko A, Sezen H, Bicici E, Demir A, Farah AF. Interface slip model for reinforced concrete columns strengthened with concrete jacketing. Rev La Constr 2020;19:180–9.
[24]   Bousias SN, Biskinis D, Fardis MN, Spathis A-L. Strength, Stiffness, and Cyclic Deformation Capacity of Concrete Jacketed Members. ACI Struct J 2007;104:521–31.
[25]   Júlio ENBS, Branco FAB. Reinforced concrete jacketing - Interface influence on cyclic loading response. ACI Struct J 2008;105:471–7.
[26]   Vandoros KG, Dritsos SE. Concrete jacket construction detail effectiveness when strengthening RC columns. Constr Build Mater 2008;22:264–76.
[27]   Steel01 Material - OpenSeesWiki n.d.
[28]   Concrete01 Material -- Zero Tensile Strength - OpenSeesWiki n.d.
[29]   Sung YC, Liu KY, Su CK, Tsai IC, Chang KC. A study on pushover analyses of reinforced concrete columns. Struct Eng Mech 2005;21:35–52.
[30]   Bousias S, Spathis A-L, Fardis MN. SEISMIC RETROFITTING OF COLUMNS WITH LAP-SPLICES VIA RC JACKETS. 13th World Conf. Earthq. Eng., Vancouver, B.C., Canada: 2004.