engleski

Finite element modelling of the behaviour of connections in the stability analysis of thin-walled beam-type structures

This work presents a one-dimensional FE formulation for stability analysis of thin-walled beam-type structures, taking into account effects of connection flexibilities. The tangent matrix of a conventional 14-degree-of-freedom beam element is derived by applying the linearized virtual work principle and Vlasov’ s assumption. The material is homogeneous, isotropic and linear-elastic. Flexible connections are allowed to occur at finite element nodes by modifying elastic and geometric stiffness matrices of a conventional beam element. A special transformation matrix is derived for that purpose. Stability analysis is performed in an eigenvalue manner, neglecting pre-buckling deformations and assuming an ideal structural geometry and loading conditions.

structural stability; thin-walled beam-type structures; flexible connections; space beam element

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