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<p>Engineered cementitious composite (ECC)-encased concrete filled steel tube (CFST) columns represent an innovative composite member that synergistically harnesses the advantages of ECC and CFST, exhibiting superior load-bearing capacity and ductility compared to existing concrete-encased CFST columns. Building on previous research, this study investigates the post-fire eccentric loading behavior of ECC-encased CFST columns based on heat transfer theory and finite element (FE) theory. Initially, constitutive models considering temperature parameters for different materials (ECC, concrete, and steel) were proposed, subsequently establishing a temperature field analysis model for ECC-encased CFST columns under the effects of heating and cooling during a fire. Mechanical performance analysis models were then developed to assess the behavior of ECC-encased CFST columns under normal temperature and post-fire conditions. The reliability of the FE models was verified, with a particular focus on the eccentric loading failure mechanism of ECC-encased CFST columns after a fire. Furthermore, based on the proposed FE models, a comprehensive parametric analysis was conducted to investigate the eccentric loading performance of the composite columns in the post-fire scenario. The paper focuses on the numerical study and parametric analyses ECC-encased CFST columns exposed to fire, contributing to the enhancement of structural safety in fire-prone environments.</p>

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Nonlinear Analysis of Engineered Cementitious Composite-Encased Concrete Filled Steel Tube Columns Under Eccentric Loading After Fire Exposure

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Jinlong Pan,
  • Yuqin Sun,
  • Guanhua Li,
  • Yingfan Wang,
  • Mohamed Elchalakani,
  • Jingming Cai

摘要

Engineered cementitious composite (ECC)-encased concrete filled steel tube (CFST) columns represent an innovative composite member that synergistically harnesses the advantages of ECC and CFST, exhibiting superior load-bearing capacity and ductility compared to existing concrete-encased CFST columns. Building on previous research, this study investigates the post-fire eccentric loading behavior of ECC-encased CFST columns based on heat transfer theory and finite element (FE) theory. Initially, constitutive models considering temperature parameters for different materials (ECC, concrete, and steel) were proposed, subsequently establishing a temperature field analysis model for ECC-encased CFST columns under the effects of heating and cooling during a fire. Mechanical performance analysis models were then developed to assess the behavior of ECC-encased CFST columns under normal temperature and post-fire conditions. The reliability of the FE models was verified, with a particular focus on the eccentric loading failure mechanism of ECC-encased CFST columns after a fire. Furthermore, based on the proposed FE models, a comprehensive parametric analysis was conducted to investigate the eccentric loading performance of the composite columns in the post-fire scenario. The paper focuses on the numerical study and parametric analyses ECC-encased CFST columns exposed to fire, contributing to the enhancement of structural safety in fire-prone environments.