Dynamic post-buckling behaviour of plate girders: Fid-Bau Portal

Dynamic post-buckling behaviour of plate girders

Ravinger, Ján

AbstractA linear elastic material is assumed and a geometrically non-linear theory, taking account of the influence of initial imperfections, is applied. By including inertia forces, the problem of the post-buckling behaviour of slender webs with flanges (stiffeners) is extended into dynamics. Using an example of a slender web loaded in compression, two main dynamic non-linear effects are explained: •- The case with a linear increase of load in terms of time, when the parameter of dynamic buckling of a slender web is defined.•- The case of a harmonic load when it is shown that, if we take into consideration the full non-linear theory as well as the initial displacements, the effect of the parametric resonance does not occur in its typical form.For both types of the load, the significant influence of the initial imperfection is shown. The finite element method, amended by a transformation using buckling modes as plate basic variational functions, is employed in a solution of the dynamic post-buckling behaviour of a thin-walled girder loaded by bending and shear, and of a thin-walled panel loaded by a partial edge load.