Abstract
Generally, the first-order reliability method (FORM) is an efficient and accurate reliability method for problems with linear limit state functions (LSFs). It is showed that the FORM formula may produce inaccurate results when the LSF is defined by mathematical forms introduced as gray function. Thus, the original FORM formula may provide the results with huge errors. In this paper, a probabilistic optimization model as refined FORM (R-FORM) is presented to search most probable failure point (MPP) with the accurate results for gray LSFs. The cross-entropy optimization (CEO) method is utilized to search MPP in proposed R-FORM model. Several reliability problems are applied to illustrate the accuracy of the R-FORM compared to the conventional FORM formula. Results illustrate that the R-FORM provides more accurate results than the FORM for gray performance functions.
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Ghohani Arab, H., Rashki, M., Rostamian, M. et al. Refined first-order reliability method using cross-entropy optimization method. Engineering with Computers 35, 1507–1519 (2019). https://doi.org/10.1007/s00366-018-0680-9
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DOI: https://doi.org/10.1007/s00366-018-0680-9