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<p>This paper presents a millimeter-level deformation monitoring method for suspender replacement of suspension bridges, utilizing 3D laser scanning technology. Suspenders, which are essential load-transferring components of suspension bridges, are vulnerable to corrosion and fatigue damage caused by environmental conditions and loading factors. In addition, the short hangers in the middle span are easily damaged due to the relative movement of the main cable and the bridge girder, resulting in a short life compared with those long hangers. The method introduced in this paper is utilizing Terrestrial Laser Scanner (TLS) assisted by reflectors, which effectively mitigates vibration-induced noise and ensures precise localization of geometric changes. This approach was investigated in a suspension bridge spanning over 1080&#xa0;m. The results revealed that the main cable’s deformation can be controlled within 0.5‰ after the suspender replacement, while the deformation of the girder was under 0.6‰. Additionally, the length variations of replaced suspenders were all kept within 3.3‰, indicating that the replacement process had a minimal impact on the bridge structure. Overall, the bridge's deformation throughout the construction process remained within controllable limits, with no significant effects on the stability of the main cable or girder. Furthermore, the construction quality met safety requirements. The monitoring data demonstrate that 3D laser scanning technology can efficiently capture millimeter-level geometric changes in kilometer-scale bridges, confirming its high-precision and multi-target monitoring capabilities in complex construction environments.</p>

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Millimeter-level deformation monitoring of short suspenders in a kilometer-scale suspension bridge using terrestrial laser scanning

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Yanjie Zhu,
  • Tong Zhou,
  • Wen Xiong,
  • Beiyang Zhang,
  • C. S. Cai

摘要

This paper presents a millimeter-level deformation monitoring method for suspender replacement of suspension bridges, utilizing 3D laser scanning technology. Suspenders, which are essential load-transferring components of suspension bridges, are vulnerable to corrosion and fatigue damage caused by environmental conditions and loading factors. In addition, the short hangers in the middle span are easily damaged due to the relative movement of the main cable and the bridge girder, resulting in a short life compared with those long hangers. The method introduced in this paper is utilizing Terrestrial Laser Scanner (TLS) assisted by reflectors, which effectively mitigates vibration-induced noise and ensures precise localization of geometric changes. This approach was investigated in a suspension bridge spanning over 1080 m. The results revealed that the main cable’s deformation can be controlled within 0.5‰ after the suspender replacement, while the deformation of the girder was under 0.6‰. Additionally, the length variations of replaced suspenders were all kept within 3.3‰, indicating that the replacement process had a minimal impact on the bridge structure. Overall, the bridge's deformation throughout the construction process remained within controllable limits, with no significant effects on the stability of the main cable or girder. Furthermore, the construction quality met safety requirements. The monitoring data demonstrate that 3D laser scanning technology can efficiently capture millimeter-level geometric changes in kilometer-scale bridges, confirming its high-precision and multi-target monitoring capabilities in complex construction environments.