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

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  • Receive Date: 25 November 2022
  • Revise Date: 14 April 2023
  • Accept Date: 23 April 2023
  • First Publish Date: 23 April 2023