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TECHNICAL PAPERS

Implications of Inspection Updating on System Fatigue Reliability of Offshore Structures

[+] Author and Article Information
Torgeir Moan, Ruxin Song

Department of Marine Structures, Norwegian University of Science and Technology, 7034 Trondheim, Norway

J. Offshore Mech. Arct. Eng 122(3), 173-180 (Apr 14, 2000) (8 pages) doi:10.1115/1.1286601 History: Received March 02, 2000; Revised April 14, 2000
Copyright © 2000 by ASME
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References

Madsen, H. O., 1985, “Random Fatigue Crack Growth and Inspection,” Proc., 4th ICOSSAR, Int. Assoc. for Structural Safety and Reliability, Vol. 1, pp. 475–484.
Jiao,  G., and Moan,  T., 1990, “Methods of Reliability Model Updating Through Additional Events,” Struct. Safety, 9, No. 2, pp. 139–153.
Moan, T., 1997, “Current Trends in the Safety of Offshore Structures,” Keynote Lecture, Proc., 7th ISOPE, Vol. VI, Honolulu, HI.
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Newman,  J. C., and Raju,  I. S., 1981, “An Empirical Stress Intensity Factor Equation for the Surface Crack,” Eng. Fract. Mech., 15, Nos. 1–2, pp. 185–192.
Almar-Næss, A., ed., 1985, Fatigue Handbook—Offshore Steel Structures, Tapir Press, Norway.
Broek, D., 1986, Elementary Engineering Fracture Mechanics, Dordrecht, Martinus Nijhoff.
Madsen, H. O., et al., 1986, Methods of Structural Safety, Prentice-Hall, Inc., Englewood Cliffs, NJ.
Marley, M. J., and Moan, T., 1992, “Time Variant Formulation for Fatigue Reliability,” Proc. OMAE, Paper No. 92-1203, Calgary, AB, Canada.
Hohenbichler,  M., and Rackwitz,  R., 1983, “First-Order Concepts in System Reliability,” Struct. Safety, 1, No. 3, pp. 177–188.
Gollwitzer,  S., and Rackwitz,  R., 1983, “Equivalent Components in First Order System Reliability,” Reliab. Eng., 5, pp. 99–115.
Gollwitzer,  S., and Rackwitz,  R., 1988, “An Efficient Numerical Solution to the Multinormal Integral,” Probab. Eng. Mech., 3, No. 2, pp. 98–101.
Dunnett,  C. W., and Sobel,  M., 1955, “Approximation to the Probability Integral and Certain Percentage Points of a Multivariate Analogue of Students t-Distribution,” Biometrika, 42, pp. 258–260.
Curnow,  R. N., and Dunnett,  C. W., 1962, “The Numerical Evaluation of Certain Multivariate Normal Integrals,” Ann. Math. Stat., 33, No. 2, pp. 571–579.
Madsen, H. O., 1987, “Model Updating in Reliability Theory,” Proc. ICASP-5, Vancouver, Canada.
Itagaki, H., Akita, Y., and Nitta, A., 1983, “Application of Subjective Reliability Analysis to the Evaluation of Inspection Procedures on Ship Structures,” Proc. Int. Symp. On the Role of Design, Inspection and Redundancy in Marine Structural Reliability, National Academic Press, Nov.
Shinozuka, M., and Deodatis, O., 1989, “Reliability of Marine Structures under Bayesian Inspection,” Report of Princeton University, Princeton, NJ. Feb.
Vårdal, O. T., and Moan, T., 1997, “Predicted versus Observed Fatigue Crack Growth. Validation of Probabilistic Fracture Mechanics Analysis of Fatigue in North Sea Jackets,” Proc. 16th OMAE, Paper No. 1334, Yokohama, Japan.
Moan, T., et al., 1997, “In-Service Observations of Cracks in North Sea Jackets. A Study on Initial Crack Depth and POD Values,” Proc. 16th OMAE, Paper No. 1335, Yokohama, Japan.
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Moan, T., et al., 1993, “Reliability-Based Fatigue Design Criteria for Offshore Structures Considering the Effect of Inspection and Repair,” Proc. 25th OTC, Vol. 2, pp. 591–599, Paper No. 7189, Houston, TX.
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Figures

Grahic Jump Location
Basic parametric sensitivity studies at t=4 yr—(a) sensitivity measures of mean values, (b) sensitivity measures of standard deviation
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Reliability of a single joint based on different number of inspection events with no crack detection
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Reliability of a single component updated when no crack is detected
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Reliability of a single joint updated through no crack detection with different correlation between Mi and IEj (cc denotes correlation coefficient)
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Reliability of a single joint updated through crack detected and measured at t=4 yr (cc denotes correlation coefficient)
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Reliability of a single joint updated through repeated inspections with no crack detection
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Reliability updating of a series system of five joints with no crack detection (cc denotes correlation coefficient)
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Reliability of a series system with all five joints updated with one joint inspected based on two updating approaches
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Reliability of a series sub-system of five uninspected joints set updated based on inspection of one to five other joints

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