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Effects of Corrosion Depth on Wind-Induced Collapse Performance of an Angle Steel Transmission Tower

Author

Listed:
  • Zhibin Tu

    (Nanxun Innovation Institute, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China)

  • Jianfeng Yao

    (Nanxun Innovation Institute, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
    Energy Engineering Group Zhejiang Power Design Institute Co., Ltd., Hangzhou 310012, China
    College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China)

  • Zhitong Liu

    (Nanxun Innovation Institute, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China)

  • Xing Zhou

    (Hangzhou Jiangnan Talent Service Co., Ltd., Hangzhou 310012, China)

  • Ligang Zhang

    (Zhejiang Huayun Power Engineering Design Consulting Co., Ltd., Hangzhou 310016, China)

Abstract

Transmission towers in coastal and industrial areas have experienced significant corrosion due to prolonged exposure to atmospheric pollutants and saline moisture, which poses a risk to structural safety. To evaluate the impact of corrosion depth on wind-induced collapse performance of an angle steel transmission tower, a survey of 18 angle steel towers in Ningbo, China, was conducted. Finite element models (FEMs) incorporating observed corrosion patterns were developed to analyze natural vibration characteristics and progressive collapse. The collapse modes of both corroded and uncorroded towers were identified, and high-risk failure member was determined. The results indicate that the corrosion depth below the lower cross-arm can be considered representative of the overall corrosion condition of the tower. Torsional natural frequency of the angle steel tower is particularly sensitive to corrosion due to the critical role of diagonal members. Collapse analysis further reveals that moderate corrosion levels can reduce the tower’s wind resistance to below the design threshold, potentially compromising safety under extreme weather conditions. The diagonal member below the lower cross-arm is identified as a high-risk failure component. Strengthening this member, by up-grading from L75×6 to L90×6, can significantly enhance the tower’s tolerance to corrosion.

Suggested Citation

  • Zhibin Tu & Jianfeng Yao & Zhitong Liu & Xing Zhou & Ligang Zhang, 2025. "Effects of Corrosion Depth on Wind-Induced Collapse Performance of an Angle Steel Transmission Tower," Energies, MDPI, vol. 18(10), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:10:p:2518-:d:1654894
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