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### Scenario Based Approach to Structural Damage Detection and its Value in a Risk and Reliability Perspective

#### Abstract

A scenario- and vibration based structural damage detection method is demonstrated though simulation. The method is Finite Element (FE) based. The value of the monitoring is calculated using structural reliability theory. A high cycle fatigue crack propagation model is assumed as the damage mechanism. The statistical properties of the monitoring system (the distribution of the detectable damage) are estimated using a log-linear regression for signal response data from simulation. The value of monitoring is then calculated as the difference in expected utility for the structure with- and without monitoring. Monte Carlo Sampling (MCS) is used to estimate the probabilities and the tower of an onshore NREL 5MW wind turbine is given as a calculation case.