Abstract
The global buckling problem of nearly periodic trusses, including intermediate weak members and disordered panels, is considered. The possibility of local buckling or plastification of individual bars is neglected. The problem is solved numerically using a finite element program. The results show the buckling load factor as well as the buckled mode shapes as functions of a disorder related parameter. These relations are found to be of a nonlinear nature for both the critical loads and the normalized displacements of selected nodes of the studied structures for a given mode shape. Thus, small changes in the disorder related parameter result in a sharp decrease of normalized displacements everywhere but at a certain region of the trusses presented. These results suggest that the phenomenon of buckling mode localization may be utilized in order to passively control structural elastic instability.
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