An axisymmetric aluminum silo model with a single, standardized geometric imperfection of its lateral surface is considered. The silo is wind - loaded only. The paper is focused on the critical, or limit value of wind pressure, both producing a loss of stability of the silo. This value is affected by vertical coordinate (position) of the imperfection and the angular relation between the imperfection and the wind direction. Reliability of a silo is assessed in three variants: direct Monte Carlo simulation (MCS), MCS with variance reduction techniques and the Response Surface Method (RSM). Comparative analysis is finally conducted.
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