Fatigue Reliability for Offshore Structures
Publication: Journal of Structural Engineering
Volume 110, Issue 10
Abstract
The results of a four‐year project, sponsored by the American Petroleum Institute, to investigate the fatigue design process in the welded joints of steel offshore structures are summarized. Fatigue damage expressions were formulated. A simple analytical expression for damage based on the rainflow method of cycle counting in a wide band process was constructed. Because fatigue design factors have significant uncertainty, a reliability approach, using the lognormal format, was developed. The performance of Miner's rule was characterized statistically, as was modeling error associated with the process of computing fatigue stresses in a joint from oceanographic data. Procedures of S‐N data analysis were developed, and characteristic S‐N data sets were presented. The reliability format was employed to construct a design rule for low period structures. It is argued that the new design rule is more discriminating in that it can account for service life, wave spectra, water depth, platform dynamics, as well as the location of the joint in the structure.
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References
1.
Dowling, N. E., “Fatigue Failure Predictions for Complicated Stress‐Strain Histories,” Journal of Materials, Vol. 7, No. 1, Mar., 1972.
2.
Kinra, R. K., and Marshall, P. W., “Fatigue Analysis of the Cognac Platform,” fournal of Petroleum Technology, Mar., 1980, pp. 377–386.
3.
Maddox, N. R., and Wildenstein, A. W., “A Spectral Fatigue Analysis for Offshore Structures,” Proceedings of the Offshore Technology Conference OTC 2261, May, 1975.
4.
Maddox, N. R., “A Deterministic Fatigue Analysis for Offshore Structures,” Journal of Petroleum Technology, July, 1975, pp. 901–912.
5.
Marshall, P. W., “Problems in Long Life Fatigue Assessment for Fixed Offshore Structures,” Preprint 2638, ASCE Water Resources Convention, San Diego, Calif., 1976.
6.
Marshall, P. W., and Luyties, W. H., “Allowable Stress for Fatigue Design,” presented at BOSS '82, Boston, Mass., Aug., 1982.
7.
Martindale, S. M., and Wirsching, P. H., “Reliability‐Based Progressive Fatigue Collapse,” Journal of Structural Engineering, ASCE, Vol. 109, No. ST8, Aug., 1983.
8.
Miles, J. W., “On Structural Fatigue Under Random Loading,” Journal of the Aeronautical Sciences, Nov., 1954.
9.
Miner, M. A., “Cumulative Damage in Fatigue,” Transactions of the ASME, Vol. 67, 1945.
10.
Nolte, K. G., and Hansford, J. E., “Closed Form Expressions for Determining the Fatigue Damage of Structures Due to Ocean Waves,” OTC Paper 2606, May, 1976.
11.
Proposed New Fatigue Design Rules for Steel Welded Joints in Offshore Structures, UK‐DEn, AERE Harwell, Oxfordshire, England, 1981.
12.
“Rationalization of Safety and Serviceability Factors in Structural Codes,” CIRIA Report 63, 6 Storey's Gate, London, SWIP 3AU, England, 1976.
13.
“Recommended Practices for Planning, Designing, and Constructing Fixed Offshore Platforms, API RP2A, 13th Edition, Jan., 1982.
14.
Wirsching, P. H., and Light, M. C., “Probability Based Fatigue Design Criteria for Offshore Structures,” Final Report, American Petroleum Institute, PRAC Project 79‐15, 1979.
15.
Wirsching, P. H., “Fatigue Reliability in Welded Joints of Offshore Structures,” Proceedings of the 1979 Offshore Technology Conference, OTC 3380, Houston, Tex., 1979. Also published in International Journal of Fatigue, Apr., 1980.
16.
Wirsching, P. H., and Light, M. C., “Fatigue Under Wide Band Random Stresses,” Journal of the Structural Division, ASCE, Vol. 106, No. ST7, July, 1980.
17.
Wirsching, P. H., and Hsieh, H. C., “The Linear Model in Probabilistic Design,” Journal of the Engineering Mechanics Division, ASCE, Vol. 106, No. EM5, Dec., 1980.
18.
Wirsching, P. H., “Digital Simulation of Fatigue Damage in Offshore Structures,” presented at the 1980 ASME Winter Annual Meeting and published in the Symposium proceedings, Computational Methods for Offshore Structures ASME, 1980.
19.
Wirsching, P. H., “Fatigue Reliability Analysis in Offshore Structures,” presented at the October, 1981, ASCE National Convention, held at St. Louis, Mo., also published in Probabilistic Methods in Structural Engineering, ASCE, M. Shinozuka and J. T. P. Yao, eds., Nov., 1981.
20.
Wirsching, P. H. “Probability Based Fatigue Design Criteria for Offshore Structures,” Final Report, American Petroleum Institute, PRAC Project 81‐15, 1983.
21.
Wirsching, P. H., “Fatigue Damage Assessment Models for Offshore Structures,” Earthquake Behavior and Safety of Oil and Gas Storage Facilities, PVP, Vol. 77, ASME, 1983.
22.
Wirsching, P. H., Stahl, B., and Nolte, K. G., “Probabilistic Fatigue Design for Ocean Structures,” Journal of the Structural Division, ASCE, Vol. 103, No. ST10, Oct., 1977.
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Copyright © 1984 ASCE.
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Published online: Oct 1, 1984
Published in print: Oct 1984
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