A 3D FINITE ELEMENT MODEL FOR THE DETERMINATION OF VIBRATION REDUCTION INDEX FOR JOINTS WITH FLOATING FLOORS

This paper is in the context of building acoustics and the aim is to obtain a more accurate approach of the acoustic insulation p rediction on constructive solutions, quantifying the contribution of the structure borne sound. It is necessary to point out that the standard UNE-EN 12354, in his parts 1, 2 a nd 3 (1, 2, 3), provides some tools for its estimation. However, these tools are not ac curate enough and a better quantification of sound flanking transmission is ne eded. On the other hand, the procedure for laboratory flanking transmission dete rmination is presented in (4). A similar procedure is used for in situ measurements, but the comparison between experimental and theoretical results is not satisfa ctory at all (5, 6). Numerical methods can facilitate the implementation of acoustic proje cts and provide better results at a low economic cost. In this work we present 3D Finite El ement Model for the determination of vibration reduction index on joints with floatin g soils. This work can be considered a continuation of (7), where a 2D model was presented .