The purpose of this study is to recognize usual facade sound insulation problems that affect a construction's acoustical quality by measuring the facade's sound insulation. Thirteen different situations were evaluated through in situ measurements in Curitiba, Brazil. By measuring buildings in different locations with constructive materials and different designs, this research found that the performance of the majority of evaluated facades did not reach the minimum proposed by both Brazilian and Portuguese standards. These results indicate that the sound insulation quality in Brazilian buildings is low and is mainly due to constructive imperfections and the use of materials with unfavorable acoustical properties.
An evaluation was made of the acoustic environment of the Green Line North (GLN) by noise mapping calculations. In addition, the equivalent sound pressure levels, L eq , that reach the facades of a residential building and a hospital located along the GLN, were simulated to determine the noise levels to which they are subjected. The simulated noise levels were compared with the maximum allowable noise levels established by Curitiba Municipal Law and by the Brazilian standard on Noise Assessment in Populated Areas. It was concluded unequivocally that, in the current situation, noise pollution affects the hospital and the gated community. A simulation of heavy vehicle traffic reduction was performed, aiming at evaluating the impact of this mitigation measure. Even the reduction of number of heavy vehicle to 10% of the original number proved to be insufficient to attend values established by the municipal law and the Brazilian standard.
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