Model correction factor method for reliability problems involving integrals of non-Gaussian random fields

P. Franchin, Ove Dalager Ditlevsen, Armen Der Kiureghian

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The model correction factor method (MCFM) is used in conjunction with the first-order reliability method (FORM) to solve structural reliability problems involving integrals of non-Gaussian random fields. The approach replaces the limit-state function with an idealized one, in which the integrals are considered to be Gaussian. Conventional FORM analysis yields the linearization point of the idealized limit-state surface. A model correction factor is then introduced to push the idealized limit-state surface onto the actual limit-state surface. A few iterations yield a good approximation of the reliability index for the original problem. This method has application to many civil engineering problems that involve random fields of material properties or loads. An application to reliability analysis of foundation piles illustrates the proposed method. Keywords: Directional simulation on a cone; First order reliability method; Model correction factor method; Nataf field integration; Non-Gaussion random field; Random field integration; Structural reliability; Pile foundation reliability
Original languageEnglish
JournalProbabilistic Engineering Mechanics
Volume17
Pages (from-to)109-122
ISSN0266-8920
Publication statusPublished - 2002

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