Measurement and calculation of sound transmission across junctions of solid timber building elements

Regular paper

Simon Mecking

University of Applied Sciences Rosenheim

Monday 1 june, 2015, 12:00 - 12:20

Auditorium 2 (592)

The number of multi-storey buildings in timber construction increases continuously. Compared to concrete and brick constructions the planning process of sound insulation of a wooden building causes much higher effort. Reasons are missing planning data and planning tools for sound insulation. Suitable, computer-based tools, which enable a simulation already in an early planning phase of a building, could help to reduce the planning effort significantly. One possibility to calculate the in-situ airborne and impact sound insulation is to combine the Finite Element Method (FEM) and the Statistical Energy Analysis (SEA) in a coupled model, which consider the direct transmission path of the building elements and the flanking transmission paths. The SEA-based calculation of the sound insulation according to EN 12354 requires the vibration reduction indices of the transfer paths at a junction of structural elements. This paper shows actual measurement results of the Operational Vibration Analysis and the vibration reduction indices of coupled Cross Laminated Timber elements. In the process the elastic layers, the pressure and the fasteners were diversified. In addition the modelling of the junction by using a commercial SEA tool will be presented and the comparison of the calculated with the measured results. From this comparison conclusion about the valid frequency domain for the Statistical Energy Analysis will be presented. The results are based on the current status of the research project 'Vibroakustik im Planungsprozess für Holzbauten' funded by the German Research Foundation (DFG) and German Federation of Industrial Research Associations (AIF). It is carried out by Technical University Munich, ift Rosenheim and University of Applied Sciences Rosenheim.

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