1999 Volume 64 Issue 521 Pages 41-46
This paper presents some experimental results concerning with vibration characteristics of reinforced concrete floor slabs in the actual building construction. An experimental modal analysis is applied to analyse the problem. This research develops experimental equipments and a measuring method. Through experiment, some values of the reciprocity of FRF, coherence function and modal parameters are observed at several points on the slab. This research proposes how from an analysis of those values the optimal location of vibration driving point can be determined. Some results are summarized as follows: (1) The values of modal parameters obtained from this experiments are nearly equal to ones shown in past researches, (2) For the determination of floor slab vibration characteristics, modal participation of lower modes (e.g. 1st and 2nd mode) are relatively more significant than that of higher modes, (3) It is shown that both W-type and S-type mode shape clearly appear at the floor slab near the separation wall and (4) The optimal location of driving point determined is some point on the floor slab away from the beams.
