Adaptive Reliability-Based Inspection Strategies for Structures Subject to Fatigue

by M. Fujita, Shimizu Corp, Japan,
G. Schall, Shimizu Corp, Japan,
R. Rackwitz, Shimizu Corp, Japan,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


Metallic structures subject to substantial load-induced fatigue must be inspected from time to time and, possibly, repaired or even put out of service if the damage has reached critical values. An adaptive strategy for inspection and possible subsequent repair is proposed where both the inspection time and the decision criteria for repair can be optimized with respect to the total cost. At each inspection the structural state is updated via Bayes' theorem. As an example Paris-Erdogan crack propagation law is chosen and the failure criterion is taken as crack instability. Gaussian process loading is assumed. The theoretical developments are applied to an example typical for offshore structures.

Subject Headings: Structural reliability | Inspection | Fatigue (material) | Adaptive systems | Gaussian process | Offshore structures | Rehabilitation | Cracking

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