Abstract
In the last decade, with the increasing number and size of installed offshore platforms, involving enormous costs, and creating eventual danger for human life and ecology, the application of structural safety concepts became mandatory. In order to meet that challenge it is necessary to implement practical tools, to be applied during the structural design phase and during operation, which can also be useful in helping to optimize inspection plans and maintenance routines, thus enhancing the safety aspects of such equipment.
This paper describes a cooperative effort, established between COPPE, the research center of the Federal University of Rio de Janeiro, and Petrobras, the brazilian oil company, for the development and application of a computer program to evaluate probability of failure of structural systems, to be used for the determination of the reliability characteristics of offshore structures. This program was implemented in a parallel computer with a host associated to a 21-node 68020 Motorola processor, having a 2 MB memory.
The techniques used for the evaluation of the component probability, and of the system probability, are first discussed. Some comments regarding the computer implementation are also included. Two examples illustrate the practical application of the software developed. The first is a small tower-like structure, while the second is a brazilian platform, studied for intact and damaged conditions, using traditional and reliability based techniques. Several comparisons are made and the impact of the additional knowledge gained using reliability techniques, for improving the inspection plans, is discussed.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Freudenthal A. M., “Safety and the Probability of Structural failure”, ASCE Transactions, Vol. 121, 1956
Julian O. G., “Synopsis of First ProQress Report on the Committee on Factors of Safety”, Journal of the Structural Division, Vol. 83, No. ST4, July 1957
Moses F. and Kinser D. E., “Optimum Structural Design with Failure Probability Constraints”, AIAA Journal, Vol. 5, No. 6, pp 1152–1158, 1967
Hasofer A. M. and Lind N. C., “Exact and Invariant Second-Moment Code Format”, ASME Journal of the Engineering mechanical Division, Vol. 100, No. EM1, pp 111–121, 1974
Pavia A. P., Yin P. K., Corder P. R., “Effects of the Design, fabrication and Installation on the Structural Reliability of Offshore Platforms”, OTC 3026. Vol. 4, pp 451–458, 1977
Fjeld S., “Reliability of Offshore Structures”, OTC 3027, Vol 4, pp 459–471, 1977
Packwitz R. and Fiessler S., “Structural Reliability under Combined Random Load Sequences”, Computer and Structures, Vol. 9, 1978
Ditlevsen O., “Narrow Reliability Sounds for Structural Engineering”, ASCE Journal of the Structural Division, Vol. 7, No. 4, December 1979
Bea R. G., “Reliability Considerations in Offshore Platforms Criteria”. ASCE Journal of the Structural Division. Vol. 106, No. ST9, pp 1835–1863, 1980
Moses F., “System Reliability Analysis of Platform Structures”, 1980
Murotsu V. “Reliability Analysis of Truss Structures by Using the Matrix Method”. ASME Transactions, Journal of Mechanical Design. Vol 102, pp 756–799, 1980
Moses F. “Risk Analysis and Reliability-Based Design for Offshore Structures”. Ocean Science Engineering, Vol.8, No. 1, pp 71–97, 1979
Crohas H. “Relibility Analysis of Offshore Platforms under Extreme Environmental Loadino”, OTC 4826. 1984
Edwards G. “Some Recent Applications of Reliability in Offshore Structural Engineering”, OTC 4827, 1984
Frangopol D. M., “Interactive Reliability-Based structural Optimization”, Computer and Structures, Vol. 19, No. 4, pp 559–563, 1984
Bea R. G., “Requalifying Existing Offshore Platforms”, Petroleum Engineer, TU 417, 1987
Sagrilo L. V. S. and Prates de Lima E., “Reliability of Truss structures Using Parallel Computing”, in portuguese, X Ibero and latin American Congress on Computational methods in Engineering, Proceedings, pp 449–463, Porto, Portugal, 1989
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1991 Computational Mechanics Publications
About this paper
Cite this paper
Sagrilo, L.V.S., de Lima, E.P., Ferrante, A.J., Rodriguez Hormazabal, S.G. (1991). Reliability Computer Analysis of Offshore Platforms. In: Brebbia, C.A., Ferrante, A.J. (eds) Reliability and Robustness of Engineering Software II. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3026-4_25
Download citation
DOI: https://doi.org/10.1007/978-94-011-3026-4_25
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-85312-132-6
Online ISBN: 978-94-011-3026-4
eBook Packages: Springer Book Archive