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Sensitivity analysis of an optimized bar-spring model with hill-top branching
Authors:M. Ohsaki
Affiliation:(1) Department of Architecture and Architectural Systems, Kyoto University, Sakyo, Kyoto, 606-8501, Japan
Abstract:Summary Characteristics of optimal solutions under nonlinear buckling constraints are investigated by using a bar-spring model. It is demonstrated that optimization under buckling constraints of a symmetric system often leads to a structure with hill-top branching, where a limit point and bifurcation points coincide. A general formulation is derived for imperfection sensitivity of the critical load factor corresponding to a hill-top branching point. It is shown that the critical load is not imperfection-sensitive even for the case where an asymmetric bifurcation point exists at the limit point.
Keywords:Sensitivity analysis  Elastic stability  Hill-top branching  Optimization
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