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Suspender ropes play a vital role in suspension bridges, directly affecting their structural integrity and durability, especially under prolonged operational conditions. The dynamic response and tensile forces of the suspender cables on the Menai Suspension Bridge were examined in preparation for replacing the original components, which had been in use since 1938. An extensive on-site study was conducted, involving forced vibration assessments on some suspender cables to analyze their dynamic characteristics and determine their tension forces. Custom designed accelerometers and detailed finite element analysis in ANSYS were utilized to develop precise suspender models, which were validated through in-site jack tension tests and compared against theoretical formula considering varying effective lengths. The results emphasized the considerable impact of boundary constraints on shorter suspenders. This research highlights the necessity of accurately modeling boundary conditions, utilizing vibration-based tension assessment methods, and managing support displacements during maintenance procedures. The models presented in this work establish a strong basis for structural health monitoring and future maintenance planning for the suspenders of the Menai Suspension Bridge.

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Utilizing Forced Vibration Testing for Suspenders’ Tension Evaluation in Bridge Structures: Insights from the Menai Suspension Bridge

  • 会议论文

  • 发表日期：

    2025年

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  • Omar K. As-Saadi,
  • Zhen Sun,
  • Kerry Evans,
  • Carlos Moutinho,
  • Thomas Inglis,
  • Elsa Caetano

摘要

Suspender ropes play a vital role in suspension bridges, directly affecting their structural integrity and durability, especially under prolonged operational conditions. The dynamic response and tensile forces of the suspender cables on the Menai Suspension Bridge were examined in preparation for replacing the original components, which had been in use since 1938. An extensive on-site study was conducted, involving forced vibration assessments on some suspender cables to analyze their dynamic characteristics and determine their tension forces. Custom designed accelerometers and detailed finite element analysis in ANSYS were utilized to develop precise suspender models, which were validated through in-site jack tension tests and compared against theoretical formula considering varying effective lengths. The results emphasized the considerable impact of boundary constraints on shorter suspenders. This research highlights the necessity of accurately modeling boundary conditions, utilizing vibration-based tension assessment methods, and managing support displacements during maintenance procedures. The models presented in this work establish a strong basis for structural health monitoring and future maintenance planning for the suspenders of the Menai Suspension Bridge.