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<p>This research quantifies the severe degradation of initial bending stiffness in ring plate-wedge joint caused by connecting plate socket hole defects at 0 to 2&#xa0;mm depth. Experimental bending tests revealed that defect-free joint exhibited high stiffness at 52.29 kN&#xa0;m/rad, significantly exceeding the code recommended threshold of 20 kN&#xa0;m/rad. Crucially, stiffness declined dramatically with increasing defect depth: joint with 1&#xa0;mm defect showed reduced stiffness of 23.19 kN&#xa0;m/rad, merely approaching the code limit, while those with 2&#xa0;mm defects suffered a critical loss, plummeting to 12.83 kN&#xa0;m/rad and failing to meet the standard. Finite element simulations confirmed this detrimental trend, yielding values of 56.33, 26.33 and 13.73 kN&#xa0;m/rad for defect-free, 1&#xa0;mm defect, and 2&#xa0;mm defect joints, respectively. This establishes a clear 1&#xa0;mm defect depth threshold for joint integrity and code compliance, components exceeding this defect level require immediate replacement. Based on practical engineering case research, joint stiffness directly influences structural load-bearing capacity. Alongside, a series of parametric analyses were conducted, and multi-parameter optimization incorporating these findings enhanced structural stability: When initial imperfections are considered, the critical load factor increases by 53.89%, while without considering imperfections, it increases by 50.11%, with material savings of 17.7 tons corresponding to 12.16% optimization efficiency.</p>

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Study on the Initial Bending Stiffness of the Ring Plate-Wedge Joint and the Bearing Capacity of the Formwork Support Considering the Defects

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Jianshuo Wang,
  • Siyu Pu,
  • Zhihua Chen,
  • Zhanwu Li,
  • Hao Wang

摘要

This research quantifies the severe degradation of initial bending stiffness in ring plate-wedge joint caused by connecting plate socket hole defects at 0 to 2 mm depth. Experimental bending tests revealed that defect-free joint exhibited high stiffness at 52.29 kN m/rad, significantly exceeding the code recommended threshold of 20 kN m/rad. Crucially, stiffness declined dramatically with increasing defect depth: joint with 1 mm defect showed reduced stiffness of 23.19 kN m/rad, merely approaching the code limit, while those with 2 mm defects suffered a critical loss, plummeting to 12.83 kN m/rad and failing to meet the standard. Finite element simulations confirmed this detrimental trend, yielding values of 56.33, 26.33 and 13.73 kN m/rad for defect-free, 1 mm defect, and 2 mm defect joints, respectively. This establishes a clear 1 mm defect depth threshold for joint integrity and code compliance, components exceeding this defect level require immediate replacement. Based on practical engineering case research, joint stiffness directly influences structural load-bearing capacity. Alongside, a series of parametric analyses were conducted, and multi-parameter optimization incorporating these findings enhanced structural stability: When initial imperfections are considered, the critical load factor increases by 53.89%, while without considering imperfections, it increases by 50.11%, with material savings of 17.7 tons corresponding to 12.16% optimization efficiency.