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<p>This study proposes a novel welded beam-to-column connection featuring star-shaped auxetic perforations in the beam web to enhance seismic performance. A total of 27 parametrically varied finite element models were constructed to evaluate the impact of auxetic geometric parameters under FEMA-350 cyclic loading using ANSYS. The models were parametrically varied by adjusting star angle, perforation area, spacing, and the number of openings. Validation was conducted through comparison with the SJ-8 experimental connection. The results revealed significant improvements in structural behavior, particularly in terms of strength retention, ductility, rotation capacity, and energy dissipation. The top-performing configuration, ST-50-3-A-H, exhibited a peak strength of 132.79 kN, a strength degradation ratio of only 9.22%, and a ductility coefficient of 6.09, along with wide and stable hysteresis loops. These findings demonstrate that the integration of auxetic geometry into steel moment connections offers a promising strategy for improving seismic resilience. Further research is recommended to validate the proposed designs through full-scale experimental testing and to assess their practical applicability in structural engineering.</p>

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The Seismic Performance of Auxetically Holed Welded Steel Connections

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Oğuzhan Akarsu,
  • Abdulkadir Cüneyt Aydin

摘要

This study proposes a novel welded beam-to-column connection featuring star-shaped auxetic perforations in the beam web to enhance seismic performance. A total of 27 parametrically varied finite element models were constructed to evaluate the impact of auxetic geometric parameters under FEMA-350 cyclic loading using ANSYS. The models were parametrically varied by adjusting star angle, perforation area, spacing, and the number of openings. Validation was conducted through comparison with the SJ-8 experimental connection. The results revealed significant improvements in structural behavior, particularly in terms of strength retention, ductility, rotation capacity, and energy dissipation. The top-performing configuration, ST-50-3-A-H, exhibited a peak strength of 132.79 kN, a strength degradation ratio of only 9.22%, and a ductility coefficient of 6.09, along with wide and stable hysteresis loops. These findings demonstrate that the integration of auxetic geometry into steel moment connections offers a promising strategy for improving seismic resilience. Further research is recommended to validate the proposed designs through full-scale experimental testing and to assess their practical applicability in structural engineering.