For investigation of the free vibration of rib floors discrete calculation schemes of discrete masses are used in the given work. Examples on calculation of floors and systems of crossed beams with different load schemes are given. The calculation of a reinforced concrete floor of an industrial building is given as well. The application of the discrete calculation schemes allows more precisely and fully determine spectrums of the frequencies and modes of the vibrations than calculation according to existing instructions. Programme for computer calculation is composed.
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