УВОДПоузданост и применљивост нових метода за динамичку анализу танкозидних носача обично се проберава упоређивањем са другим већ познатим методама које су доступне у литератури и/или са резултатима МКЕ. Нажалост, у већини случајева недостајe упoређивање са експерименталним резултатима, нарочито кад је у питању танкозидни носач отвореног попречног пресека. Један начин за проверу поузданости метода прорачуна је примена те методе на експерименталнom моделu. За упоређивање служе резултати прорачуна, који сe могу добити и експерименталним путем. Ове карактеристике су најчешће првих неколико најнижих сопствених фреквенција модела. Један од начина за одређивање сосптвених фреквенција модела је снимање амплитудо-фазних карактеристика вибрација у стању резонанције. Аутори Falco
This paper presents the procedure for the experimental determination of the horizontal deflection of a point due to the horizontal force effects on the model made of Plexiglas with proportionally the same geometry as the numeric example applied in works of several authors for the analysis of the tall building cores. This examination offers the experimental analysis possibility of the reinforced-concrete core on effects of the horizontal load of seismic forces and the wind. These results are compared with the results obtained by FEM showing significant agreement.
PurposeThe purpose of this paper is to contribute to the solution of the buckling and resonance stability problems in inelastic beams and wooden plane trusses, taking into account geometric and material defects.Design/methodology/approachTwo sources of non-linearity are analyzed, namely the geometrical non-linearity due to geometrical imperfections and material non-linearity due to material defects. The load-bearing capacity is obtained by the rheological-dynamical analogy (RDA). The RDA inelastic theory is used in conjunction with the damage mechanics to analyze the softening behavior with the scalar damage variable for stiffness reduction. Based on the assumed damages in the wooden truss, the corresponding external masses are calculated in order to obtain the corresponding fundamental frequencies, which are compared with the measured ones.FindingsRDA theory uses rheology and dynamics to determine the structures' response, those results in the post-buckling branch can then be compared by fracture mechanics. The RDA method uses the measured P and S wave velocities, as well as fundamental frequencies to find material properties at the limit point. The verification examples confirmed that the RDA theory is more suitable than other non-linear theories, as those proved to be overly complex in terms of their application to the real structures with geometrical and material defects.Originality/valueThe paper presents a novel method of solving the buckling and resonance stability problems in inelastic beams and wooden plane trusses with initial defects. The method is efficient as it provides explanations highlighting that an inelastic beam made of ductile material can break in any stage from brittle to extremely ductile, depending on the value of initial imperfections. The characterization of the internal friction and structural damping via the damping ratio is original and effective.
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