Reliability analysis of randomly excited FE modelled structures with interval mass and stiffness via sensitivity analysis

Alba Sofi, Filippo Giunta, Giuseppe Muscolino

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The present study focuses on reliability analysis of linear discretized structures with uncertain mass and stiffness parameters subjected to stationary Gaussian multi-correlated random excitation. Under the assumption that available information on the uncertain parameters is poor or incomplete, the interval model of uncertainty is adopted. The reliability function for the extreme value stress process is evaluated in the framework of the first-passage theory. Such a function turns out to have an interval nature due to the uncertainty affecting structural parameters. The aim of the analysis is the evaluation of the bounds of the interval reliability function which provide a range of structural performance useful for design purposes. To limit detrimental overestimation caused by the dependency phenomenon, a sensitivity-based procedure is applied. The main advantage of this approach is the capability of providing appropriate combinations of the endpoints of the uncertain parameters which yield accurate estimates of the bounds of the interval reliability function for the extreme value stress process as long as monotonic problems are dealt with. Two case studies are analyzed to demonstrate the accuracy and efficiency of the presented method.

Original languageEnglish
Article number107990
Number of pages23
JournalMechanical Systems and Signal Processing
Volume163
DOIs
Publication statusPublished - 2022

Keywords

  • Interval analysis
  • Interval reliability function
  • Random excitation
  • Sensitivity analysis
  • Uncertain parameters

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