Dynamic parameters of offshore structures, such as frequencies, modal shapes, modal strain energy (MSE) and frequency response functions (FRF) are numerically and experimentally studied to detect the crack in the structures. A 3-pile and a 4-pile platform are analyzed. And a model of the 3-pile platform has been constructed for the experimental verification. When a crack occurs, the parameters of the structure will change. The shift of these parameters may be applied to identify the crack, the location and even the crack magnitude. Wavelet transform can be employed to find the singularity of the signal, so as to predict the early crack. The dynamic parameters due to mass change are also evaluated.

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