ABSTRACT
Cable monitoring and safety evaluation are crucial for cable-supported bridges in service. Due to its cost-effectiveness and convenience, vibration-based methods are widely used in cable monitoring. The fatigue assessment and damage detection of the cable using vibration monitoring data are developed in this paper. For the fatigue assessment of cables, a real-time monitoring and sensing scheme based on the amplitude and phase estimation method and the Miner's linear fatigue damage accumulation theory is proposed. It considers both the real stress amplitude spectrum as well as the changes in the mechanical properties of cables simultaneously. For cable damage detection, a method using the cable dynamic stiffness theory and time-varying frequency to detect damage in operational cables is proposed. In this method, empirical mode decomposition and moving average methods are used to remove the effects of traffic and temperature on cable frequency. K-means clustering method is used for identifying cable damage.
