Influence of the type of fastening of multi-layered closing panels on the estimate of the sound transmission loss.
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2016
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Industrialized closing systems appear as rational solutions in steel-structured construction.
These closing systems, consisting of multi-layered panels, have been applied
in projects where it is intended to obtain a high sound transmission loss without raising
the cost and without using a lot of mass. However, acoustic isolation depends on several
factors, including the type of connection between the panels, requiring a preliminary
study of the acoustic performance of the closing system to prevent future interventions.
This paper uses a simplified graphical method to evaluate the influence of the type
of connection (line-line, line-punctual or punctual-punctual) of industrialized closing
panels on the estimation of the sound transmission loss that occurs across the wall
constituted by these panels. The panels are combined, forming multi-layered closings
interleaved by a layer of air, either without or with a sound-absorbing material between
them. The results show that it is necessary to check the effectiveness of each type of
fastening of the closing systems because, for example, for the frequency range between
500 and 2,000 Hz, the sound transmission loss of a closing system consisting of cementitious
plate with glass wool and line-punctual and punctual-punctual connections
exceeds in 6.25% the sound transmission loss of the same system with line-line fastening.
For a system composed of expanded polystyrene with glass wool, the sound transmission
loss provided by line-line fastening exceeds in 7.0% the sound transmission loss
of the same closing system with line-punctual and punctual-punctual fastenings.
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Multi-layered closing systems, Sound transmission loss, Graphical method, Acoustical performance
Citação
RIBAS, R. A. de J.; SOUZA, H. A. de. Influence of the type of fastening of multi-layered closing panels on the estimate of the sound transmission loss. Influence of the type of fastening of multi-layered closing panels on the estimate of the sound transmission loss. International Engineering Journal, v. 69, p. 425-433, 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2016000400425>. Acesso em: 29 set. 2017.