Low-Cycle Fatigue Reliability of Offshore Structures Subjected to Earthquakes

by Richard J. Nielsen, Univ of Idaho, United States,
Darel Tracy, Univ of Idaho, United States,

Document Type: Proceeding Paper

Part of: Structural Materials


This paper develops and implements a methodology for predicting probabilistically the damage an offshore structure will experience in an earthquake. The analysis begins with the probability distribution for the waiting time to a given number of range-pair cycles due to a nonstationary Gaussian process. The distribution for range-pair cycles is related to the distribution for toplevel-up cycles. The waiting time distribution is then transformed into a distribution for the number of events in a given time. The probability distribution for the number of events is combined with the Manson-Coffin damage accumulation law to predict the expected damage.

Subject Headings: Structural reliability | Offshore structures | Fatigue (material) | Earthquakes | Gaussian process | Load and resistance factor design | Damage (structural) | Stationary processes

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