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<p>Rehabilitating composite columns using external retrofitting techniques presents a significant challenge, particularly in accurately predicting their ultimate load capacity. This study addresses this challenge by developing and validating refined design equations for retrofitted composite columns, based on a comprehensive parametric analysis using the finite element software Abaqus. Guided by Eurocode 4 principles, twenty-six finite element models were developed, simulating various retrofitting configurations: welded steel wire mesh, steel spiral stirrups, steel straps, and steel angles. The proposed design equations demonstrated excellent agreement with the finite element analysis (FEA) results, achieving an average correlation of 99.15%. Furthermore, validation against independent experimental data yielded a strong average correspondence of 94.30%, confirming the reliability and accuracy of the proposed equations. The study reveals that increasing the diameter of the welded steel wire mesh by 3, 6, and 9&#xa0;mm resulted in load capacity increases of up to 1.44%, highlighting the influence of retrofitting parameters. The proposed equations enable engineers to predict retrofitted column performance without costly experimental trials.</p>

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Performance-based design of externally retrofitted composite columns: a finite element analysis and parametric study

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Moustafa El-Sepahy,
  • Hesham Ali Ezz-Eldeen,
  • Emad Said Salem

摘要

Rehabilitating composite columns using external retrofitting techniques presents a significant challenge, particularly in accurately predicting their ultimate load capacity. This study addresses this challenge by developing and validating refined design equations for retrofitted composite columns, based on a comprehensive parametric analysis using the finite element software Abaqus. Guided by Eurocode 4 principles, twenty-six finite element models were developed, simulating various retrofitting configurations: welded steel wire mesh, steel spiral stirrups, steel straps, and steel angles. The proposed design equations demonstrated excellent agreement with the finite element analysis (FEA) results, achieving an average correlation of 99.15%. Furthermore, validation against independent experimental data yielded a strong average correspondence of 94.30%, confirming the reliability and accuracy of the proposed equations. The study reveals that increasing the diameter of the welded steel wire mesh by 3, 6, and 9 mm resulted in load capacity increases of up to 1.44%, highlighting the influence of retrofitting parameters. The proposed equations enable engineers to predict retrofitted column performance without costly experimental trials.