The paper discusses damage detection of suspension bridges. The detection is based on comparison of initial signature (FRF, mode shapes and so on) of intact bridges with that of damaged bridges. Three waveform recognition indices based on FRF, i.e., the waveform chain code (WCC), the adaptive template methods (ATM) and the signature assurance criterion (SAC), and three mode shape-based methods, i.e., the coordinate modal assurance criterion (COMAC), the flexibility and the curvature mode shapes are used for damage detection of suspension bridges. Their sensibility to damage in deck of Tsing Ma suspension bridge is compared. This paper also discusses the application of the strain mode shape method to damage detection. The results show that among the 3 waveform recognition indices, ATM and WCC are more sensitive to damage than SAC. All of them, however, can not predict damage locations. The results also show that among the 3 mode shape-based methods, the flexibility and the curvature mode shape method are more sensitive to damage than COMAC, and can predict damage locations. It is demonstrated by experiment and analysis on uniform cantilever beams that strain modal shape methods are better for damage detection in some aspects.
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