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Flanking sound transmission in steel concrete composite floors

The research in this paper was inspired by observations that in-situ performance of flanking sound appeared to be better than the conventional theory suggested.  In this paper we describe measurements and predictions of wall airborne sound insulation tests in buildings with a continuous steel-concrete composite floor beneath a plasterboard separating partition.  Although this is a common building typology with many applications including dwellings, hotels, offices and schools, there is a marked absence of specific data in the scientific literature that can be used to calculate flanking transmission between rooms through the floor.  As such, empirical data must be relied upon for such calculations.  However, calculations based on empirical data are demonstrated to under-estimate the sound insulation achieved in practice.

Beth Paxton developed the work undertaken for her award-winning Diploma project into this peer-reviewed conference paper.  We present field measurements of both direct floor sound insulation, for the profiled steel-concrete composite slab alone, and velocity level differences for flanking transmission.  This new input data for flanking calculations with the EN 12354-1 model gives a more reliable prediction of sound transmission between adjacent rooms.  This data overcomes the need to rely on previous in-situ measurements with different floor and wall details.  This new data enables floating floors to be omitted in many instances of this building typology.   Control of flanking sound can be more suitably specified with appropriate floating floors where it is required for particular performance requirements.

You can download the full paper here, and the presentation slides here.

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