Abstract

A study supported by the American Petroleum Institute established that load and resistance factor design offers improvement in design and is supported by credible data, can yield improved designs of greater reliability and/or economy and is in reasonable accordance with current design practices. This paper discusses the criteria for calibrating the ISO-LRFD based on the API studies. Other topics include actual versus notional reliabilities, regional load factors, member versus system reliability, and selecting a design return period. The paper also describes safety indices for the combined loading interaction formulas. [S0892-7219(00)01301-7]

1.
API RP 2A, 1993, Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms, American Petroleum Institute, 20th Edition.
2.
NRC, 1981, “Safety and Offshore Oil,” Marine Board, National Research Council, Washington, DC.
3.
Moses, F., 1980, “Applicability of Reliability Analysis in Offshore Design Practice,” Final Report for API PRAC 79-22, American Petroleum Institute; see, also, Reports 81-2 to 87-22.
4.
API RP 2A-LRFD 1993, Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms-Load and Resistance Factor Design, American Petroleum Institute, First Edition.
5.
Moses, F., and Larrabee, R. D., 1988. “Calibration of the Draft LRFD-RP2A for Fixed Platforms,” Proceedings of the Offshore Technology Conference, Houston, TX.
6.
AISC, 1996, Manual of Steel Construction—Load and Resistance Factor Design, American Institute of Steel Construction,” Chicago, IL.
7.
Efthymiou, M., van de Graaf, J. W., Tromans, P. S., and Hines, I. M., 1996, “Reliability Based Criteria for Fixed Steel Offshore Platforms,” Proceedings of the 15th International Conference on Offshore Mechanics and Arctic Engineering, Florence, Italy, pp. 129–141.
8.
Snell, R., 1997,“ISO Offshore Structures Standard,” Proceedings of Offshore Technology Conference, Paper 8421, Houston, TX.
9.
Wisch, D. J., 1997,“Fixed Steel Standard: ISO & API Developments-ISO TC 67/SC 7/WG 3,” Proceedings of Offshore Technology Conference, Paper 8423, Houston, TX.
10.
Moses, F., 1991, “Load and Resistance Factor Design-Updating and Expanded Applications,” Final Report for API PRAC 89-22, American Petroleum Institute.
11.
Ditlevsen
,
O.
,
1997
, “
Structural Reliability Codes for Probabilistic Design—A Debate Paper Based on Elementary Reliability and Decision Analysis Concepts
,”
Structural Safety
,
19
, No. 3.
12.
Stahl, B., and Lloyd, J. R., 1995, “Debate on the Application of Structural Reliability Techniques for Offshore Structural Engineering,” The Institution of Structural Engineers, London, UK, October 31.
13.
Anderson
,
W. D.
,
Silbert
,
M. N.
, and
Lloyd
,
J. R.
,
1982
, “
Reliability Procedure for Fixed Offshore Platforms
,”
Journal of the Structural Division, ASCE
,
108
, pp.
2517
2538
.
14.
Ghosn, M., and Moses, F., 1997, “Design of Highway Bridges for Extreme Events,” NCHRP Project 12–48, Transportation Research Board, Washington, DC.
15.
Cornell, C. A., 1995, “Structural Reliability—Some Contributions to Offshore Technology,” OTC 7753, Proceedings of the Offshore Technology Conference.
16.
Puskar, F. J., Aggarwal, R. K., Cornell, C. A., Moses, F., and Petrauskas, C., 1994, “A Comparison of Analytically Predicted Platform Damage to Actual Platform Damage During Hurricane Andrew,” Proceedings of Offshore Technology Conference, Paper OTC 74773, Houston, TX.
17.
Stahl, B., Aune, S., Gebara, J. M., and Cornell, C. A., 1998, “Acceptance Criteria for Offshore Platforms,” Proceedings, Offshore Mechanics and Arctic Engineering Conference, Lisbon, Portugal.
18.
Moses, F., 1999, “Calibration of ISO Offshore Platform Design Standard,” Final Report for API PRAC 95-22, American Petroleum Institute.
19.
ISO Tubular Members Document-Draft A12, 1997, private communication from T. M. Hsu. Lloyd, J., 1995, “Setting Design and Assessment Criteria,” private communication.
20.
Gierlinski, J. T., and Shetty, N. K., 1995, “Resistance Design Strategies,” E&P Forum Report No. 3, 15/229. London, UK.
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