Free-form reticulated shell structures searched for maximum buckling strength

In this paper, a scheme of shape optimization is proposed for maximum buckling strength of free-form steel reticulated shells. In order to discuss the effectiveness of objective functions with respect to maximizing buckling strength, several different optimizations are applied to shallow steel singl...

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Bibliographic Details
Main Authors: Takiuchi, Yuji, Kato, Shiro, Nakazawa, Shoji
Format: Conference Proceeding
Language:English
Subjects:
Elastic buckling
Maximization
Optimization
Plastic buckling
Shape optimization
Strength
Online Access:Get full text
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Summary:In this paper, a scheme of shape optimization is proposed for maximum buckling strength of free-form steel reticulated shells. In order to discuss the effectiveness of objective functions with respect to maximizing buckling strength, several different optimizations are applied to shallow steel single layer reticulated shells targeting rigidly jointed tubular members. The objective functions to be compared are linear buckling load, strain energy, initial yield load, and elasto-plastic buckling strength evaluated based on Modified Dunkerley Formula. With respect to obtained free-forms based on the four optimization schemes, both of their elastic buckling and elasto-plastic buckling behaviour are investigated and compared considering geometrical imperfections. As a result, it is concluded that the first and fourth optimization methods are effective from a viewpoint of buckling strength. And the relation between generalized slenderness ratio and appropriate objective function applied in buckling strength maximization is made clear.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.5005635