Influence of the type of fastening of multi-layered closing panels on the estimate of the sound transmission loss

Abstract 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.

摘要：工业化封闭式围护系统（industrialized closing systems）是钢结构建筑中的合理解决方案。这类由多层面板构成的围护系统，已被应用于追求高隔声量（sound transmission loss）且无需额外提升成本、无需大量增加结构质量的工程场景中。然而，隔声性能受多种因素影响，其中包括面板间的连接形式，因此需预先开展围护系统声学性能研究，以避免后续整改作业。本文采用简化图解法，研究工业化围护面板的连接形式（线-线、线-点及点-点连接）对该类面板构成墙体的隔声量预估结果的影响。面板组合形成多层围护结构，层间设置空气层，可选择填充吸声材料。研究结果表明，需对围护系统各类连接形式的有效性进行验证：例如在500~2000Hz频率范围内，采用胶凝板+玻璃棉搭配线-点及点-点连接的围护系统，其隔声量比采用线-线连接的同类型系统高出6.25%；而对于采用膨胀聚苯板（expanded polystyrene）+玻璃棉的围护系统，采用线-线连接的隔声量则比采用线-点及点-点连接的同类型系统高出7.0%。