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<p>Bamboo scrimber has strong potential as a dowel-bearing material, and studying its temperature-dependent connection behavior is crucial for advancing joint design under cold-region and fire conditions. Fifty dowel-bearing specimens (five per temperature) were tested in uniaxial compression across ten temperature levels from − 20&#xa0;°C to 250&#xa0;°C. The microstructural analyses were conducted to examine how temperature affects mechanical properties. Results show that taking − 10&#xa0;°C as the reference temperature at which the maximum dowel-bearing strength is observed, the dowel-bearing strength and initial stiffness decrease progressively by approximately 73% and 70% as temperature increases to 250&#xa0;°C. During this decline, an inflection appears in the dowel-bearing strength–temperature curve at around 100&#xa0;°C, which is attributed to the evaporation of bound moisture and the onset of hemicellulose/lignin glass transition, as observed by microstructural tests. Beyond the inflection, the failure mode shifts with increasing temperature from brittle splitting to plastic crushing accompanied by hole-wall collapse. Based on the experimental data, a tri-linear temperature reduction factor model was established to describe dowel-bearing strength evolution over − 20&#xa0;°C to 250&#xa0;°C. The predicted values show reasonable agreement with the experimental results.</p>

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Investigations on dowel-bearing strength of bamboo scrimber under different temperature conditions

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Xiaohan Li,
  • Yang Wei,
  • Zhiyi Yuan,
  • Silu Huang,
  • Yi Ding,
  • Jiawei Chen

摘要

Bamboo scrimber has strong potential as a dowel-bearing material, and studying its temperature-dependent connection behavior is crucial for advancing joint design under cold-region and fire conditions. Fifty dowel-bearing specimens (five per temperature) were tested in uniaxial compression across ten temperature levels from − 20 °C to 250 °C. The microstructural analyses were conducted to examine how temperature affects mechanical properties. Results show that taking − 10 °C as the reference temperature at which the maximum dowel-bearing strength is observed, the dowel-bearing strength and initial stiffness decrease progressively by approximately 73% and 70% as temperature increases to 250 °C. During this decline, an inflection appears in the dowel-bearing strength–temperature curve at around 100 °C, which is attributed to the evaporation of bound moisture and the onset of hemicellulose/lignin glass transition, as observed by microstructural tests. Beyond the inflection, the failure mode shifts with increasing temperature from brittle splitting to plastic crushing accompanied by hole-wall collapse. Based on the experimental data, a tri-linear temperature reduction factor model was established to describe dowel-bearing strength evolution over − 20 °C to 250 °C. The predicted values show reasonable agreement with the experimental results.