抄録
In a previous paper, it was shown through the eigenvalue analysis that the finite element method with coupling of the in-plane and bending displacements (called CIB-FEM) is useful for the calculation of floor impact sounds of void slabs. In a present paper, the heavy weight floor impact sound is directly calculated by the dynamical analysis of void slabs based on CIB-FEM and the characteristic function method for the sound space analysis. As the results of this study the followings are revealed. The results of analysis on the void slab agree well with the measured values. The change in the acoustic radiation efficiency considerably affects a level of the floor impact sound of void slab. The floor impact sound of the void slab is approximately determined by the weight of void. A conversion formula of void slab into the equivalent slab thickness and unit weight gives the accurate results on the calculation of the floor impact sound.
