Codification of Design Load Criteria Subject to Modeling Uncertainty
Publication: Journal of Structural Engineering
Volume 117, Issue 10
Abstract
Structural code development is greatly influenced by the requirement to take into account the effect of model imperfection and model uncertainty whenever it arises. The extent to which these uncertainties should be reflected in design specification factors such as partial factors or return periods is discussed. Code calibration techniques, which allow greater flexibility in the representation of model uncertainties in design check equations, are investigated from a decision theoretical point of view. A two‐step calibration procedure is proposed that involves the use of two separate sets of design factors. The first set reflects the effects of basic variabilities. The second set consists of so‐called ignorance factors that can be adjusted as a function of model quality. The general characteristics of suitable utility assignment functions are discussed and they are related to the calculation of safety measures under uncertainty. The advantages and the limitations of the proposed calibration procedure are discussed. A practical application illustrates the feasibility of the approach.
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References
1.
Cornell, C. A. (1969). “Bayesian statistical decision theory and reliability‐based design.” Proc. Int. Conf. on Struct. Safety and Reliability, Smithsonian Inst., Washington, D.C., 47–66.
2.
De Kraker, A., Tichler, J., and Vrouwenvelder, A. (1982). “Safety, reliability and service life of structures.” Heron, 27(1), 1–87.
3.
Der Kiureghian, A., and Liu, P.‐L. (1986). “Structural reliability under incomplete probability information.” J. Engrg. Mech., ASCE, 112(1), 85–104.
4.
De Kiureghian, A. (1989). “Measures of structural safety under imperfect states of knowledge.” J. Struct. Engrg., ASCE, 115(5), 1119–11140.
5.
Der Kiureghian, A. (1990). “Bayesian analysis of model uncertainty in structural reliability.” 3rd IFIP Working Conf. on Reliability and Optimization of Structural Systems, ASCE, New York, N.Y.
6.
Ditlevsen, O. (1982). “Model uncertainty in structural reliability.” Struct. Safety, 1(1), 73–86.
7.
de Finetti, B. (1977). “Probabilities of probabilities: A real problem or a misunderstanding?” Proc. 1st Int. Conf. on New Developments in the Applications of Bayesian Methods, Elsevier, New York, N.Y., 1–10.
8.
Frieze, P. A., Wickham, A. H. S., and Niu, X. (1990). “Adapting proposed USA LRFD fixed offshore platform design practice to the North Sea environment.” Proc. OMAE 90, American Society of Mech. Engrs. (ASME), New York, N.Y., 2, 41–47.
9.
“Guidelines for the development of limit states design.” (1981). CSA Special Publication S408‐1981, Canadian Standards Association, Roxdale, Ontario, Canada.
10.
Gumbel, E. J. (1958). Statistics of extremes. Columbia Univ. Press, New York, N.Y.
11.
Maes, M. A. (1986). “Calibration of partial factors in the new CSA code for fixed offshore production structures.” Tech. Report No. 9, Environmental Protection Branch, Canada Oil and Gas Lands Administration, Ottawa, Canada.
12.
Maes, M. A. (1990). “Uncertainties: Why, how and to what extent should they be considered in structural design codes?.” Proc. Annual Conf. of Canadian Society for Civil Engineering, Canadian Society for Civ. Engrg. (CSCE), Montreal, Canada, 4(2), 801–820.
13.
Marschak, J., et al. (1975). “Personal probabilities of probabilities.” Theory and Decision, 6(1), 121–153.
14.
Raiffa, H. (1968). Decision analysis. Random House, New York, N.Y.
15.
Turkstra, C. J. (1970). Theory of structural design decisions. Study No. 2, Solid Mechanics Studies Series, University of Waterloo, Waterloo, Ontario, Canada.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 117 • Issue 10 • October 1991
Pages: 2988 - 3007
Copyright
Copyright © 1991 ASCE.
History
Published online: Oct 1, 1991
Published in print: Oct 1991
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