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<p>Joint stiffness is a critical factor influencing the stability of a reticulated shell. This study introduces an improved POLO-1 joint with excellent mechanical performance, developed based on the original POLO-1 joint, and systematically examines its bending performance under pure bending loads. Numerical simulations of 18 finite element models confirm that the novel gear bolt joint significantly outperforms the original gear bolt joint in bending performance. According to the structural similarities between the original POLO-1 joint and the original gear bolt joint, the improved POLO-1 joint is proposed. Further, using 58 finite element models and considering variations in plate thickness, bolt radii, and two distinct loading schemes, a comparative analysis of the bending performance of the original and improved POLO-1 joints is conducted. The findings are as follows: (I) Under strong-axis bending moments, varying plate thicknesses result in an 18%–30% increase in initial stiffness and a 30%–65% improvement in ultimate bending moment for the improved POLO-1 joint. (II) Under weak-axis bending moments, the improved POLO-1 joint displays a more pronounced enhancement, with initial stiffness increasing by 150%–220% and ultimate bending moment improving by 110%–250% with different plate thicknesses. (III) Under strong-axis bending moments, variations in bolt radii reveal that the improved POLO-1 joint exhibits superior bending performance compared with the original POLO-1 joint. (IV) Under weak-axis bending moments, considering bolt radii, the improved POLO-1 joint achieves a 150%–225% increase in initial stiffness and a 110%–245% improvement in ultimate bending moment. (V) The performance enhancement of the improved POLO-1 joint, when considering plate thicknesses or bolt radii, is primarily due to the evident extension of the plate’s yielding area, enabling better utilization of material properties and a notable improvement in bending performance.</p>

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Study on Bending Performance of the Improved POLO-1 Joints Based on the Configuration of Improved Gear Bolt Joints

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Haoran Gao,
  • Kaiyin Li,
  • Junjie Fang,
  • Daining Zheng,
  • Huijun Li

摘要

Joint stiffness is a critical factor influencing the stability of a reticulated shell. This study introduces an improved POLO-1 joint with excellent mechanical performance, developed based on the original POLO-1 joint, and systematically examines its bending performance under pure bending loads. Numerical simulations of 18 finite element models confirm that the novel gear bolt joint significantly outperforms the original gear bolt joint in bending performance. According to the structural similarities between the original POLO-1 joint and the original gear bolt joint, the improved POLO-1 joint is proposed. Further, using 58 finite element models and considering variations in plate thickness, bolt radii, and two distinct loading schemes, a comparative analysis of the bending performance of the original and improved POLO-1 joints is conducted. The findings are as follows: (I) Under strong-axis bending moments, varying plate thicknesses result in an 18%–30% increase in initial stiffness and a 30%–65% improvement in ultimate bending moment for the improved POLO-1 joint. (II) Under weak-axis bending moments, the improved POLO-1 joint displays a more pronounced enhancement, with initial stiffness increasing by 150%–220% and ultimate bending moment improving by 110%–250% with different plate thicknesses. (III) Under strong-axis bending moments, variations in bolt radii reveal that the improved POLO-1 joint exhibits superior bending performance compared with the original POLO-1 joint. (IV) Under weak-axis bending moments, considering bolt radii, the improved POLO-1 joint achieves a 150%–225% increase in initial stiffness and a 110%–245% improvement in ultimate bending moment. (V) The performance enhancement of the improved POLO-1 joint, when considering plate thicknesses or bolt radii, is primarily due to the evident extension of the plate’s yielding area, enabling better utilization of material properties and a notable improvement in bending performance.