Abstract

The buckling and postbuckling behaviour of thin-walled stiffened elements under uniform compression with geometric and material uncertainties are examined. The uncertainties in the geometry can arise from tolerances in cold forming, and the ones in material properties result from the uncertain values of the maximum stress at buckling and from the scatter in the value of the modulus of elasticity. A convex model is used to model the uncertainties in both geometry and material properties. The results show that in the case of elastic buckling the reduction of the buckling load due to geometric uncertainties can be significant. In the case of postbuckling, the effective width in the presence of uncertainty is found to vary within the range of experimental results.

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