Abstract
In this paper, the authors are making theoretical and experimental studies on the accurate estimation for the driving point impedance characteristics at any impact points of the concrete floor slab. The important factors which determine the impedance characteristics of floor slab are the loss factor at the fundamental and high-order modes frequencies of natural vibration and the influence of the edge fixing on the change in impedance characteristics at various impact point. The theoretical characteristics of loss factor on the assumption of the diffusive bending wave vibration was derived and compared with the experimental values which obtained from analysis on the decay time at resonant frequencies of concrete floor slabs under various slab area, span ratio and fixing. As for the influence of slab edge fixing, the degree of increase in impedance level was investigated in the case that the impact point received the influence of edge fixing from the two directions and the case that the beam girders were added.
