The vibration isolation floor using an inertial mass device developed by the authors is a floating floor structure with a clear load-deformation relationship, which enables an accurate evaluation of the excitation force of the audience’s vertical motion. Based on data obtained by measuring the vibration of a live hall floor for one year, we analyzed the excitation force of a hall floor for 1,000 people. By adjusting the inertia mass ratio considering the frequency dependence of the excitation force, the vibration isolation floor with an inertia mass device can significantly reduce the reaction force compared to a conventional floating floor.
