Abstract: The merits and limitations of vibrationally based non-destructive (NDD) methods such as frequency response only, displacement time history, system identification, acoustic emission, and work at Texas A&M University which includes the damage sensitivity or damage index method are reviewed with respect to their applicability in detecting damage to a floating structure and the findings stated. One of these methods, namely the damage sensitivity method, is reported to be suitable for detecting structural damage, with a slight adjustment, for floating platforms. Due in part to the fact that floating structures depend on the surrounding aqueous environment for their vertical support, the detection of flooding, conceivable as mass damage, is stated to be remaining outside the scope of the existing methods. A sensitivity based mass damage index is formulated for the latter case. The performance feasibility of the stiffness and mass damage indicators when applied to a floating structure, as exemplified by a bridge, is demonstrated. !13
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