Evolution of Stay Cable Monitoring Using Ambient Vibration

摘要

Within the scope of design as well as during the subsequent required maintenance of bridge structures engineers are frequently confronted with stay cables. On the one hand because cable-stayed bridges are increasingly designed and built due to their aesthetic appearance and on the other hand because the most-sensitive load carrying elements of such structures the ropes and cables -are very difficult to check on their condition and on the current cable force. Moreover undesirable vibration excitation by aerodynamic and resonance effects is a decisive criterion to maintain serviceability and ultimate limit state of the structure. For this reason efficient, non-destructive testing and assessment technologies are required without using complicated lift-off tests. The main subject of this paper is to present recent technologies which determine the cable force and the current condition of stay cables, accurately.