In the paper there is propose of numerical model for nonlinear analysis of steel frames with use of localized nonlinearity. Main concept of model consists of discreet ordering of series nonlinear finite elements - springs "zero length" in the areas of expected frames plastifikations. The frame elements between the sections with nonlinear elements behaved linear. On that way the forces in the elements of frames for the most degrees of freedom are linear in the relation of displacement, but nonlinear behaviour occurs in relatively small number degrees of freedom. This kind of model can be explicitly introduced in consideration of geometrical imperfection, backward stresses and etc. .

/pdf/plastification-process-of-steel-frames-through-540gt3ikri.pdf

Plastification process of steel frames through discretization of plastic zone

/pdf/modeling-yielding-links-of-wooden-frame-structures-mdj3v00dhc.pdf

Modeling yielding links of wooden frame structures

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Modeling yielding links of wooden frame structures