A constrained finite strip method for open and closed cross-section members

In this paper, the constrained finite strip method (cFSM) is improved by simplifying the derivation of the constraint matrix which defines the combined buckling mode space formed by global and distortional modes. In the context of the FSM, only two assumptions are made to define this particular and...

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Bibliographic Details
Published in:Thin-walled structures 2010-12, Vol.48 (12), p.955-965
Main Authors: Djafour, M., Djafour, N., Megnounif, A., Kerdal, D.E.
Format: Article
Language:English
Subjects:
Buckling
Constrained finite strip method
Constraints
Cross sections
Derivation
Distortion
Exact sciences and technology
Finite element method
Finite strips
Fundamental areas of phenomenology (including applications)
Mathematical models
Modal decomposition
Physics
Solid mechanics
Stability
Static elasticity (thermoelasticity...)
Structural and continuum mechanics
Thin walled
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Summary:In this paper, the constrained finite strip method (cFSM) is improved by simplifying the derivation of the constraint matrix which defines the combined buckling mode space formed by global and distortional modes. In the context of the FSM, only two assumptions are made to define this particular and complex subspace: (i) cylindrical plate bending (if any) and (ii) negligible in-plane transverse strains and shear strains. The constraint matrix is derived by means of procedures commonly used in numerical methods, such as FEM or FSM. This led to a simple and systematic formulation which allowed the cFSM to compute pure buckling modes for members with open and closed thin-walled cross-sections.
ISSN:0263-8231
1879-3223
DOI:10.1016/j.tws.2010.07.004