Dissertação
Determinação experimental e numérica da redução sonora aérea em paredes de alvenaria utilizadas em habitações
Fecha
2011-03-15Registro en:
PINTO, Rodrigo Barcelos. Experimental and numerical determination of the airborne sound reduction used in masonry walls of dwellings. 2011. 97 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2011.
Autor
Pinto, Rodrigo Barcelos
Institución
Resumen
In this research some kinds of masonry walls have been used as internal divisions in
three Brazilian dwelling buildings to determine the airborne sound reduction, by
experimental tests in field and computer simulations. The masonry walls studied are
composed by massive bricks, bored ceramic blocks (6 and 4 holes) and structural (7
and 10 MPa), with mortar lining in both sides. The acoustic evaluations, in field, were
accomplished according to the international rules ISO 140 part 4, ISO 717 part 1 and
ISO 354. The determination of the airborne sound reduction among places it was
accomplished from a direct and indirect sound transmission of constructive elements
of the edifications, according to the EN 12354 rule part 1 and using a commercial
computer program. The mainly results of this research showed the weighted values
of the level standard difference (DnT,w) vary from 37 to 44 decibels to the evaluated
walls. It was also observed the difference of 2 dB among the weighted values of the
level standard difference (DnT,w) and the apparently sound reduction (R w). Almost all
the masonry walls evaluated reached the minimum recommended values by the NBR
15575. In general, it happened a relation between the experimental results and the
computer simulations, mainly with the weighted values relation and the isolation
curves of the structural masonry walls. The computer simulation of the airborne
sound transmission can be a good project tool, besides the initial datas don t
represent properly the masonry material components evaluated, due to the national
datas more complete and precise.