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The composite damping floor structure (CDFS) has been developed for the control of the floor impact sound against the Heavy-Impact-Sound-Source designated by JIS A1418 in multiple-dwelling buildings. CDFS has the three-layer sandwich configuration by attaching rectangular damping steel plates (DSP) to the concrete slab. The first layer is the constraining steel plate (the upper steel), the second is the vis-co-elastic resin, and the third is the basic plate (the lower steel and concrete slab).
The traditional vibration damping theory for such sandwich configuration structure was extended in order to introduce the effect of the unit width of each rectangular DSP. The extended theoretical analysis explained the vibration loss factors obtained on the floor model tests and on the site tests with good agreement.
And also the test results of the floor impact sound radiation were explained theoretically by evaluating the effect of the loss factor on the vibration response of CDFS.
Finally the optimum design approach of CDFS was proposed focussing on the unit width and thickness arrangement of each DSP and on the mechanical properties of the resin through the parametric study based on the extended vibration damping theory.

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