In thin-walled structures, to which girders with slender web (GSW) are related, one of the weak links is their local stability. Girders with slender web are still buckling in elastic stage of loading under shear deformation. Increasing of their stability is possible to reach with installation of Analysis carried out in the work show that demands to appointment of optimum sizes of transverse stiffening ribs in Russian structural standard differ essentially from those of the foreign standards. The goal of the work is to find out the demands by which the standards are more well grounded and bring in suggestion on improving the Russian structural rules. The determined goal has been reached with GSW panels calculations FEM using the program complex ANSYS. The critical loads were determined in the shear of rectangular plates supported by transverse stiffening ribs of different sizes. The results of the FEM were compared with the calculations performed on the empirical dependencies of different standards. The result of the research was to make recommendations on the rational dimensions of the stiffening ribs, determined from the ratio of flexural stiffnesses of the reinforced plate and rib. It is noted that the presence of stiffening ribs can increase the stability of the beam wall by 15-30%. The results of the research can be used in design organisations.
The article considers the local stability of hinged supported beams with a flexible wall, supported by paired stiffeners on the supports and loaded with a concentrated force in the middle of the span. To prevent the loss of stability of the wall from compression, another edge was installed in the area of application of force. The materials considered as beams were steel, aluminum, and stainless steel. In this work, the beam material is steel C345. The study was conducted by analyzing the requirements of the Code of Practice for beams with a flexible wall in terms of the stability loss caused by the two types of deformations - shear and bending. By means of small simplifications, the requirements of the Code of Practice have been transformed into empirical dependencies convenient for practical calculations for estimating the critical loads on the beam. The finite element method with ANSYS software was used as an effective analysis tool. It has been established that in some cases the cause of loss of stability is a shift, and in others - a bend. A criterion for changing the forms of buckling was also obtained. The calculation results for the obtained dependences are in satisfactory agreement with the FEM and experimental data.
Исследована эффективность применения ребер жесткости разных размеров для повышения значения критической нагрузки стенки балок с гибкими стенками. Рассмотрена задача определения устойчивости шарнирно опертой и жестко защемленной квадратной пластины при наличии наклонного ребра жесткости. Исследования проведены методом конечных элементов и проверены экспериментально для жестко защемленной пластины. Даны рекомендации по оптимальному размеру ребра жесткости.Ключевые слова: квадратная пластина, сдвиг, устойчивость, метод конечных элементов, ребро жесткости, эксперимент, балка, гибкие стенки.
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