Análise estatística do desempenho acústico do conjunto de paredes e portas separadas por hall

Abstract

The Brazilian performance standard NBR 15575-4 (ABNT, 2013) specifies criteria for assessing the acoustic performance of internal vertical partitions (walls) in residential buildings, primarily through the weighted standardized level difference (DnTw). This study aimed to evaluate the influence of various factors on the acoustic performance of systems separating residential units, consisting of walls and doors divided by corridors (hall). Several factors were investigated individually and in combination, creating multiple experimental scenarios: (a) frequency, (b) floor level, (c) corridor reverberation time, (d) gap size under the doors of noiseemitting and receiving rooms, and (e) relative door positioning. Acoustic tests were conducted in a multifamily residential building located in Brasília, Brazil, and the data collected were statistically analyzed using spreadsheets and the R programming language. The analyses comprised ANOVA, post-hoc tests, and multiple linear regression. Significant differences among the scenarios were observed, and the final regression model exhibited strong explanatory power (adjusted R² = 0.677). Small deviations from normality in residuals were considered negligible. Key factors determining acoustic performance were identified as the logarithm of frequency, door positioning, and gap under the doors. Although corridor reverberation time was not individually statistically significant, its control proved important when combined with other acoustic treatments. The study concludes that combined acoustic interventions — such as simultaneous door misalignment, gap treatments, and reverberation time reduction — are most effective in enhancing the acoustic performance of partition systems. Additionally, intrinsic design strategies, notably door misalignment, can significantly improve acoustic insulation. This research contributes technical insights into acoustic performance in residential buildings and supports the development of effective noise control strategies in construction.