The aim of this paper is to develop a simplified method for analysis of free vibration of floor system consisting of continuous steel plate and steel frame in plane to reinforce it. The study of such orthotropic system is of practical interest and aimed at small businesses, which are not able to obtain expensive programs for performing such calculations.
The aim of this paper is to create a method for reduction of constructive weights of system of cross-beams (grillages) optimizing its elements. The study has practical application and aimed primarily to companies who design civil and industrial buildings, different types of mechanical constructions, vehicle industry, etc.
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