engleski

A beam element for the large displacement analysis of semi-rigid frames

This paper presents a one-dimensional finite element formulation for nonlinear analysis of spaced framed structures with thin-walled cross-sections. Applying the updated Lagrangian incremental formulation, equilibrium equations of a straight beam element are firstly developed. Force recovering is performed according to the external stiffness approach. Material nonlinearity is introduced for an elastic-perfectly plastic material through the plastic hinge formation at finite element ends. For this, a corresponding plastic reduction matrix is introduced in the formulation. The effectiveness of the numerical algorithm discussed is validated through a test problem.

frames; semi-rigid connections; large displacemen analysis

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