The paper presents the problem of reliability of a beam with periodically variable geometry under stochastic excitation. The approach is based on concepts of the nonasymptotic tolerance averaged model [3]. In this way we formulated the averaged equations of the structured beam which describe the length-scale effect [1,2]. Using these averaged equations we obtain the probabilistic characteristics of the beam with periodically variable geometry. We will solve the problem of reliability of this beam as the problem of the first crossing. [References: 3]
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