Some unusual problems relating to the dynamics of the industrial ferroconcrete slab ceilings weighed down with machines are consider. The choice is make on the ground of the research results concerning the real constructions. Questions which are discuss concern the change of the stiffness as the result of incorrect execution of the ceiling as well as damages arising during its use. These are two kinds of problems: these of the construction which became weaker due to the machine oil's or chemical substances' effect and unilateral constraints problems (damage of the supporting construction's components).
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