Implications of Inspection Updating on System Fatigue Reliability of Offshore Structures

Author:

Moan Torgeir1,Song Ruxin1

Affiliation:

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

Abstract

Offshore structures are considered as fail safe and inspections are carried out during their service lifetime to assess their actual condition. In this paper, the effect of inspection updating on fatigue reliability of offshore structures is investigated. In particular, the effect of inspection on the reliability of both inspected and uninspected joints is assessed dependent upon the correlation of properties of different joints. The effect of repeated inspections and inspection sample size on fatigue reliability is also investigated. The influence of inspection of certain joints on the reliability of a series system is studied and the effect of system-based updating policy on fatigue reliability is investigated. It is found that the system reliability is significantly affected by the inspection updating policy. [S0892-7219(00)00403-9]

Publisher

ASME International

Subject

Mechanical Engineering,Ocean Engineering

Reference23 articles.

1. 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.

2. Jiao, G., and Moan, T., 1990, “Methods of Reliability Model Updating Through Additional Events,” Struct. Safety, 9, No. 2, pp. 139–153.

3. Moan, T., 1997, “Current Trends in the Safety of Offshore Structures,” Keynote Lecture, Proc., 7th ISOPE, Vol. VI, Honolulu, HI.

4. Paris, P. C., and Erdogan, F., 1963, “A Critical Analysis of Crack Propagation Laws,” ASME J. Basic Eng., 85, pp. 528–534.

5. 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.

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