Abstract
A method of design change aimed at the enhancement of structural reliability is formulated. The perturbation-based stochastic finite element method is employed to evaluate the reliability index of the advanced first-order second-moment method. The enhancement of the reliability index is devised by means of the minimal design change from a baseline design, while the shift of the reliability index is incorporated in terms of an equality constraint condition. The validity of the proposed method is verified by the numerical example of a two-storeyed portal frame with uncertain Young's modulus, for which the moment of inertia of the frame members is taken as design variables.
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