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<p>Wooden columns often experience premature brittle failure due to insufficient ductility when subjected to combined axial and lateral loading. To overcome these limitations, this study developed a performance-based design framework for a hybrid reinforcement system integrating carbon fiber-reinforced polymer (CFRP) and embedded steel reinforcement. Multiscale experimental investigations demonstrate that compared to unreinforced specimens, this composite system achieves a 48.3% increase in axial load-carrying capacity and a 43.5% enhancement in lateral resistance. The improved deformation capacity stems from the synergistic interaction between continuous CFRP reinforcement and near-surface steel reinforcement. The study identified anchorage and bonding parameter thresholds that balance safety and efficiency: 120 mm anchorage length and 4 mm bonding layer thickness. Based on these findings, a quantitative design recommendation framework was established, linking bonding performance,axial load-carrying capacity, and cyclic degradation behavior. This framework provides rational guidance for the engineering design and retrofitting of composite timber columns.</p>

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Design of composite reinforced timber column with near surface mounted reinforcing bars and wrapped CFRP strips

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Wenhao Ren,
  • Siha A.

摘要

Wooden columns often experience premature brittle failure due to insufficient ductility when subjected to combined axial and lateral loading. To overcome these limitations, this study developed a performance-based design framework for a hybrid reinforcement system integrating carbon fiber-reinforced polymer (CFRP) and embedded steel reinforcement. Multiscale experimental investigations demonstrate that compared to unreinforced specimens, this composite system achieves a 48.3% increase in axial load-carrying capacity and a 43.5% enhancement in lateral resistance. The improved deformation capacity stems from the synergistic interaction between continuous CFRP reinforcement and near-surface steel reinforcement. The study identified anchorage and bonding parameter thresholds that balance safety and efficiency: 120 mm anchorage length and 4 mm bonding layer thickness. Based on these findings, a quantitative design recommendation framework was established, linking bonding performance,axial load-carrying capacity, and cyclic degradation behavior. This framework provides rational guidance for the engineering design and retrofitting of composite timber columns.