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<p>The application of external prestressing to composite beams with web openings (CBWOs) significantly extends their elastic working range and optimizes material utilization, manifested through enhanced structural yield moment and load-bearing capacity, increased stiffness, and improved mechanical performance. The present research first defines and formulates the degree of prestress in externally prestressed CBWOs. Finite element models were subsequently developed and calibrated based on experimental data. A total of 15 specimens (12 prestressed and 3 non-prestressed) were designed and simulated, incorporating three variable parameters: span-to-depth ratio (ranging from 7 to 15), type of prestressing tendons (straight vs. draped), and degree of prestress (ranging from 0.22 to 0.37). Results demonstrate that, compared to non-prestressed beams, the yield moment <i>M</i><sub><i>y</i></sub> increased by 32–70% and the ultimate capacity <i>M</i><sub><i>u</i></sub> increased by 48–60%. The tendon profile (straight or draped) exhibited a negligible impact on structural capacity. A model for the ultimate prestress increment <i>Δσ</i><sub>p, ui</sub>, dependent on the span-to-depth ratio <i>λ</i>, was established and achieved excellent accuracy in predicting <i>M</i><sub><i>u</i></sub>. These findings provide valuable insights for optimizing prestressed composite beam systems in structural engineering practice. </p>

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Failure mechanism research and load-bearing capacity of externally prestressed composite beams with web openings

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月6日

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  • Longqi Li,
  • Chun’e Wang,
  • Dongdong Li,
  • Xiaoli Yang,
  • Yi Xiao

摘要

The application of external prestressing to composite beams with web openings (CBWOs) significantly extends their elastic working range and optimizes material utilization, manifested through enhanced structural yield moment and load-bearing capacity, increased stiffness, and improved mechanical performance. The present research first defines and formulates the degree of prestress in externally prestressed CBWOs. Finite element models were subsequently developed and calibrated based on experimental data. A total of 15 specimens (12 prestressed and 3 non-prestressed) were designed and simulated, incorporating three variable parameters: span-to-depth ratio (ranging from 7 to 15), type of prestressing tendons (straight vs. draped), and degree of prestress (ranging from 0.22 to 0.37). Results demonstrate that, compared to non-prestressed beams, the yield moment My increased by 32–70% and the ultimate capacity Mu increased by 48–60%. The tendon profile (straight or draped) exhibited a negligible impact on structural capacity. A model for the ultimate prestress increment Δσp, ui, dependent on the span-to-depth ratio λ, was established and achieved excellent accuracy in predicting Mu. These findings provide valuable insights for optimizing prestressed composite beam systems in structural engineering practice.