engleski

FE model for global buckling analysis of composite beams

The paper presents a finite element beam model for global buckling analysis of composite beam type structures. Buckling phenomena can be generally manifested in three ways: as a global buckling with primary deformation of global axis, local buckling as local plate deformation as well as distortional buckling involving change in cross- sectional shape. The classical approach to the problem, assuming that the cross-section is not deformed in its own plane, can capture only the global modes. Such an approach, although not typical for composite cross sections, delivers acceptable results for structures consist of relatively slender beam members and in the cases when the global modes occur before the local or distortional. The nonlinear stability analysis is performed in the framework of updated Lagrangian incremental formulation. In order to illustrate the application of the proposed model, several numerical examples are presented. For validation purposes, the obtained results are compared with results reported in the literature and the ones obtained with shell finite elements.

composite beams ; finite element model ; global buckling analysis

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