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<p>A new type of composite column, carbon fiber reinforced polymer (CFRP) confined rubberized concrete filled steel tube (RuCFST) column, is proposed in this paper. Experimental and numerical investigations were conducted to assess its axial impact performance. Twelve CFRP-confined RuCFST specimens were fabricated and tested using drop hammer impact tests, with analyses focused on failure modes, impact force, residual bearing capacity, energy absorption, and time-history responses. A numerical model was developed in ANSYS/LS-DYNA and validated against the experiments to further predict the dynamic behavior of the composite column under varying parameters such as steel yield strength, FRP types, and CFRP layer configurations. The results showed that the impact process of CFRP confined RuCFST columns consists of three distinct phases: initial contact, stable, and descending phases. Lower rubber replacement ratios <i>R</i><sub><i>f</i></sub> led to higher peak loads, while increasing impact height <i>h</i> extended the energy dissipation duration. The failure mode shifted with higher <i>R</i><sub><i>f</i></sub>, improving ductility and shifting failure downward. The residual bearing capacity decreased as the impact height increased, with columns having 10%, 20%, and 30% <i>R</i><sub><i>f</i></sub> showing reductions of 14%, 12%, and 8%, respectively. The column with 20% <i>R</i><sub><i>f</i></sub> demonstrated the best performance at impact heights below 1.5&#xa0;m, while the 30% <i>R</i><sub><i>f</i></sub> column performed better at 1.5&#xa0;m due to higher residual capacity. Increasing steel yield strength and CFRP layers improved impact resistance, with the best performance observed in three-layer CFRP columns. CFRP showed superior confinement compared to other FRP materials.</p>

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Axial Impact Response of CFRP Confined Rubberized Concrete Filled Steel Columns: Experimental and Numerical Studies

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Xiangqing Kong,
  • Yahui Chang,
  • Yanbin Yao,
  • Youhai Guan

摘要

A new type of composite column, carbon fiber reinforced polymer (CFRP) confined rubberized concrete filled steel tube (RuCFST) column, is proposed in this paper. Experimental and numerical investigations were conducted to assess its axial impact performance. Twelve CFRP-confined RuCFST specimens were fabricated and tested using drop hammer impact tests, with analyses focused on failure modes, impact force, residual bearing capacity, energy absorption, and time-history responses. A numerical model was developed in ANSYS/LS-DYNA and validated against the experiments to further predict the dynamic behavior of the composite column under varying parameters such as steel yield strength, FRP types, and CFRP layer configurations. The results showed that the impact process of CFRP confined RuCFST columns consists of three distinct phases: initial contact, stable, and descending phases. Lower rubber replacement ratios Rf led to higher peak loads, while increasing impact height h extended the energy dissipation duration. The failure mode shifted with higher Rf, improving ductility and shifting failure downward. The residual bearing capacity decreased as the impact height increased, with columns having 10%, 20%, and 30% Rf showing reductions of 14%, 12%, and 8%, respectively. The column with 20% Rf demonstrated the best performance at impact heights below 1.5 m, while the 30% Rf column performed better at 1.5 m due to higher residual capacity. Increasing steel yield strength and CFRP layers improved impact resistance, with the best performance observed in three-layer CFRP columns. CFRP showed superior confinement compared to other FRP materials.