On the Influence of the Junctions on Wooden Buildings Structural-Acoustic Behaviour

Invited paper

David Blon


Tuesday 2 june, 2015, 09:00 - 09:20

0.1 London (90)

Acoustic and vibrational comfort is a key factor that needs to be taken into account when designing a building. In order for the actors of this industry to ensure the development of performant buildings, especially for wooden lightweight structures which have the weakness to be very sensitive to vibrations, it is necessary to study the vibro-acoustic phenomenons that take place in these structures and particularly the transmissions through the junctions and the coupling effects between the building components. The heterogeneity and the complexity of the material and the assemblies of lightweight structures complicate modelling and prediction of the acoustic behaviour. Indeed, the actual modelling tools are based on tests of every sub-structure of the assembly taken separately, without taking into account the acoustic modal behaviour of the rooms. The prediction at the scale of the building isn't thus efficient yet. In this research work, a low-frequency (20 to 200 Hz) vibro-acoustic prediction model based on a hybdrid finite element/transfer matrices formulation has been developed, and comparison with real field measurements on a full scale mock up will be presented. The influence of the junctions, and also the coupling effects between the cavity and the structure will also be presented. Validation of this model should thus improve the reliability of lightweight vibro-acoustic performance prediction.

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