Tesis
Avaliação de ferramenta de simulação da transmissão sonora para projetos de isolamento acústico em edificações habitacionais
Fecha
2014-07-19Registro en:
SILVA, Renata Costa da. Avaliação de ferramenta de simulação da transmissão sonora para projetos de isolamento acústico em edificações habitacionais. 2014. 335 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2014.
Autor
Silva, Renata Costa da
Institución
Resumen
In July, 2013, Brazil s new standard, NBR15575:2013, began to require minimum
thermal, luminal, structural and acoustical performance levels in new constructions of
residential dwellings. Thus, computer programs that simulate the sound transmission
in buildings, can serve as important tools for professionals, enabling the verification of
virtual acoustic performance of projects, quickly and economically. By being widely used
in European countries, they have the database of existing elements and building systems
in Europe. From this, this study aimed to evaluate a computational tool of simulation of
sound transmission on the reality of Brazilian buildings. Twenty households were selected
in the city of Santa Maria - RS, to be measured in situ and then simulated to airborne and
impact noise. The residences were chosen according to standard and types of building
systems. For greater representation of Brazilian buildings, residences of low, medium
and high standards were chosen. The building systems chosen were structural masonry,
structural walls with concrete or ceramic block; and reinforced concrete, with walls of
hollow brick; all with massive concrete slab. The software used for the simulations was
the SONarchitect and all the features and building elements used were entered into the
software s database. The values of L n,T , Dn,T , and RT per frequency band, and their
weighted values L n,T,w, Dn,T,w and mean RT were obtained through measurements and
simulation. The weighted measured and simulated values were similar, on the other hand,
the values obtained by frequency band showed disagreement with the lower frequencies
precisely, from 50 Hz to 100 Hz. There was also a relationship of impact sound transmission
loss with the area size of the partition, in which there is a significant increase in sound
insulation in partitions with larger areas. In addition, coefficients and safety factors were
determined for each standard and building system to be applied in the spectra of the
simulations, aiming to bring the simulated values closer to the measured ones. Parallel
with the evaluation of the computational tool, questionnaires with 150 professionals who
develop acoustic projects in the country were applied. This step had as main objective
to find out what tools and methods are mostly used by professionals in the development
of these projects. From 31 received responses, it was determined that 20.88% of the
professionals use a computational tool to develop designs. It was also possible to discover
some features such as field of expertise and graduation year, which regions they are
located, what kind of projects they develop and if they have already developed projects
based on the new standard.