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<p>High-voltage electrical post equipment is generally installed on steel supports, which amplifies the seismic inputs and degrades the seismic performance of equipment. This study proposed a variable cross-section damped steel support frame (VCDFS) with viscous dampers to reduce seismic responses of both tall and low-rise electrical equipment. The VCDFS contains a trapezoidal damper layer to generate rocking motions, enabling the diagonal viscous dampers to dissipate seismic inputs. A theoretical model of post equipment with VCDFS is established, and an optimal design procedure is proposed. The analysis shows that the remaining static stiffness ratio <i>λ</i><sub><i>k</i></sub> is the key parameter that determines the effectiveness of the VCDFS. The VCDFS reduces the average displacement and stress response of a post insulator by 39.4% and 44.6%, respectively, together with a significant decrease in the dynamic amplification factor. Therefore, it is recommended to use the VCDFS instead of the conventional latticed-steel frame in earthquake zones.</p>

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Seismic design of variable cross-section damped steel support frame for post equipment

  • 期刊论文

  • 发表日期：

    2025年1月20日

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  • Zhenyu Yang,
  • Yuhong Ma,
  • Guifeng Zhao,
  • Zhiwei Feng,
  • Mingyang Fu

摘要

High-voltage electrical post equipment is generally installed on steel supports, which amplifies the seismic inputs and degrades the seismic performance of equipment. This study proposed a variable cross-section damped steel support frame (VCDFS) with viscous dampers to reduce seismic responses of both tall and low-rise electrical equipment. The VCDFS contains a trapezoidal damper layer to generate rocking motions, enabling the diagonal viscous dampers to dissipate seismic inputs. A theoretical model of post equipment with VCDFS is established, and an optimal design procedure is proposed. The analysis shows that the remaining static stiffness ratio λk is the key parameter that determines the effectiveness of the VCDFS. The VCDFS reduces the average displacement and stress response of a post insulator by 39.4% and 44.6%, respectively, together with a significant decrease in the dynamic amplification factor. Therefore, it is recommended to use the VCDFS instead of the conventional latticed-steel frame in earthquake zones.