Retrofitting Seismically Designed Exterior Beam-Column Joints under Lateral Monotonic Loading: A Numerical Analysis Based on Experimental Testing

Articles in Press

Document Type : Regular Paper

Authors

1 Ph.D. Candidate, Department of Civil Engineering, Faculty Engineering, Razi University, Kermanshah, Iran

2 Associate Professor, Department of Civil Engineering, Faculty Engineering, Razi University, Kermanshah, Iran

3 Assistant Professor, Department of Civil Engineering, Faculty Engineering, Kerbala University, Kerbala, Iraq

Abstract

This research paper presents an experimental and numerical study on the behavior of reinforced concrete (RC) in exterior beam-column joints designed for seismic conditions. Three laboratory specimens were prepared and tested to evaluate their load-bearing capacity and study the joint behavior under a constant axial load and a gradually increasing peak monotonic load until failure. The experimental results demonstrated convergence among the specimens in terms of the load-displacement curve, displacement ductility, and energy dissipation. This was further confirmed through the use of a Finite Element (FE) analysis model. The numerical analysis exhibited significant convergence between experimental and numerical results. Additionally, the numerical model was retrofitted using Carbon Fiber Reinforced Polymer (CFRP) in two methods: model 1 (CFRP sheets only) and model 2 (CFRP sheets with strips). The retrofitting with CFRP proved suitable for enhancing structure performance, showing an improvement in failure mode and a significant increase in peak monotonic load and energy dissipation by (31 and 26) % for model 1, and by (47 and 36) % for model 2. This provides valuable insights into the behavior of RC exterior beam-column joints, highlighting the importance of retrofitting with CFRP composites.

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Journal of Rehabilitation in Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 24 January 2025

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History

  • Receive Date: 25 April 2024
  • Revise Date: 21 January 2025
  • Accept Date: 24 January 2025

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