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This paper presents a new classification system called the Marine Structure Health index (MSHi). An evaluation model based on the fuzzy Delphi analytic hierarchy process (FDAHP) has been used for estimation of health in marine concrete structures. For this purpose, fifteen types of cracking in concrete, surface distresses, and miscellaneous distresses have initially been investigated and rated. In the MSHi system, a number from 0 to 100 is assigned to the health of a structure. Based on the MSHi classification, the health of a structure is classified into five modes from the view point of distress: very poor, poor, medium, good and very good.

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