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<p>Prolonged service leads to significant degradation in the mechanical performance of ancient timber structures, increasing the risk of sudden failure during earthquakes. To address this issue, this study proposes a friction energy-dissipation brace (FEDB) for emergency collapse risk mitigation of ancient timber structures. A scaled experimental model, based on a partial structure of the Yingxian Wooden Pagoda, was designed and fabricated. Quasi-static tests were conducted to comparatively analyze the deformation, load-bearing capacity, stiffness, and energy dissipation characteristics of the structure before and after reinforcement. The results demonstrate that the proposed FEDB integrates well with the timber structure. While preserving the rocking deformation characteristics of the original structure, the FEDB significantly enhances the load-bearing capacity, stiffness, and especially energy dissipation capability, with an improvement of up to 382%. Furthermore, parametric analysis using the finite element software ABAQUS revealed that the structural load-bearing capacity, stiffness, and energy-dissipation increase with increasing bolt preload and friction coefficient of the FEDB. The installation angle of the FEDB also notably influences the reinforcement effectiveness, with the optimal performance achieved when the FEDB is horizontally arranged. This study provides valuable insights for the preventive conservation and seismic reinforcement of existing ancient timber structures.</p>

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Energy dissipation-based emergency temporary reinforcement method for ancient timber structures: experimental and numerical investigations

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Ruize Zhang,
  • Xianjie Meng,
  • Yang Cui,
  • Chengya Zhang,
  • Tieying Li,
  • Xiwang Shi

摘要

Prolonged service leads to significant degradation in the mechanical performance of ancient timber structures, increasing the risk of sudden failure during earthquakes. To address this issue, this study proposes a friction energy-dissipation brace (FEDB) for emergency collapse risk mitigation of ancient timber structures. A scaled experimental model, based on a partial structure of the Yingxian Wooden Pagoda, was designed and fabricated. Quasi-static tests were conducted to comparatively analyze the deformation, load-bearing capacity, stiffness, and energy dissipation characteristics of the structure before and after reinforcement. The results demonstrate that the proposed FEDB integrates well with the timber structure. While preserving the rocking deformation characteristics of the original structure, the FEDB significantly enhances the load-bearing capacity, stiffness, and especially energy dissipation capability, with an improvement of up to 382%. Furthermore, parametric analysis using the finite element software ABAQUS revealed that the structural load-bearing capacity, stiffness, and energy-dissipation increase with increasing bolt preload and friction coefficient of the FEDB. The installation angle of the FEDB also notably influences the reinforcement effectiveness, with the optimal performance achieved when the FEDB is horizontally arranged. This study provides valuable insights for the preventive conservation and seismic reinforcement of existing ancient timber structures.