chapter
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## ELEMENT/FLOOR BEAM

Figure 2. Calculated mode shapes, resonance frequencies and modal masses for two modes of a floor with two unrestrained edges and two edges simply supported by primary beams.

the resulting "modal" acceleration is therefore inversely proportional to which is given by the integral over the whole structure of the product of the mode shape squared and the mass distribution. Mn signifies how large a proportion of the floor is participating in the motion of this specific mode.