Abstract
A design methodology to cope with uncertain fluctuations of structural parameters is presented in line with convex model of uncertainty. The fluctuations are confined within a hyper-ellipse, in which the worst case for structural integrity is identified. The size of hyper-ellipse means range of uncertainty, then it is employed as uncertainty index. A robustness is the maximum horizon of uncertainty index such that the worst case never exceeds critical state. A design to maximize the robustness is searched for by means of conventional optimization technique. A design example concerning with six-bar truss structure under uncertain loads is demonstrated to verify the presented methodology.
