抄録
A full investigation including an influence of resonance of floor vibration caused by human action repeated at constant tempo (such as walking, aerobic dance, etc.) was done on actual floors where the natural frequency and damping were small. As a result, it was shown that the evaluation was greatly different by presence of resonance. And, the meanings of evaluation curves provided in the guideline of A.I.J. were clarified from the relations to resident's evaluation. Moreover, new analyzing methods of damping characteristic and resonance frequency were presented. Finally, the applicability of a new vibration reduction system for actual buildings, which is proposed by one of authors, was proved.
