Advanced Retrofitting Technologies for Unconfined Reinforced Concrete Columns: A Comprehensive Review

Subject Areas : Analysis of Structure and Earthquake

محمدرضا شکرزاده ¹ , mahdi sharifi ² , amir jafari ³ , Mohamad eisa Mohamaddost ⁴ , Mohammad Hesham Tahery ⁵

1 - Department of civil engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran
2 - Department of Civil Engineering, Faculty of Engineering, University of Qom, Qom, Iran
3 - Department of Civil Engineering, Science and Research Branch, Islamic Azad Uni-versity, Tehran, Iran
4 - Department of Civil Engineering, Science and Research Branch, Islamic Azad Uni-versity, Tehran, Iran
5 - Department of Civil Engineering, Science and Research Branch, Islamic Azad Uni-versity, Tehran, Iran

Received: 2024-08-31 Accepted : 2024-12-25 Published : 2025-05-20

Keywords: Active confinement, Passive confinement, Fiber-reinforced polymer, Shape memory alloy,

Abstract :

This paper provides a comprehensive review of advanced retrofitting technologies for reinforced concrete columns lacking lateral confinement. The primary goal is to review and analyze novel retrofitting methods presented in technical literature, evaluating their performance and outlining the advantages, limitations, and practical applications of each method. Initially, the fundamental principles and characteristics of the two main confinement approaches—active and passive—are discussed. Subsequently, conventional strengthening methods, including Fiber-Reinforced Polymer (FRP), Near-Surface Mounted (NSM) techniques, and the use of Shape Memory Alloys (SMA), are described in detail. By emphasizing hybrid approaches and presenting a comparative analysis from the perspectives of seismic performance, ductility, load-bearing capacity, and durability, this paper provides a practical framework for selecting the most suitable retrofitting strategy. The findings of this review could serve as a foundation for structural engineers’ decision-making processes in retrofitting projects.

References:


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