Assessment of sound transmission characteristics of traditional timber-framed dwellings in Ankara, Turkey
Regular paper
MIDDLE EAST TECHNICAL UNIVERSITY (METU)
Tuesday 2 june, 2015, 11:00 - 11:20
0.1 London (90)
Abstract:
Sound transmission characteristics of traditional timber-framed structures
in Turkey became a serious issue due to increases in complaints of residents
about noise problems in these structures. Those problems are mostly
originated from sound transmission through their floors and walls. This
study was focused on the assessment of the impact and airborne sound
transmission characteristics through the floor and wall components for
traditional timber-framed dwellings in Ankara (Turkey) and to examine their
sound transmission problems before and after repairs.
The study was composed of in-situ acoustical measurements, laboratory tests
and building acoustical simulation analyses in order to: (i) to determine
the sound absorption coefficient (&_alpha;) and sound transmission loss (TL)
characteristics of the mudbrick infill collected from the traditional
timber-framed structures by an impedance tube (ASTM C384-04:2011; ASTM
E1050-12; ISO 10534-2:2009), (ii) to assess impact and airborne sound
transmission characteristics of these structures through the floors and
walls by the in-situ (ISO 140-7:1998; ISO 140-4:1998; ISO 717-1:20013; ISO
717-2:2013) and simulation analyses. The simulation analyses were carried by
the software 'INSUL' and 'BASTIAN'. Sound transmission performances of the
construction components were assessed in terms of the acoustical parameters
of “weighted sound reduction index (Rw)”, “weighted normalized impact sound
level (Ln,w)” and “impact insulation class (IIC)”.
Joint interpretation of the data have shown the sound transmission
characteristics of floor and wall components in traditional timber-framed
dwellings, changes due to repairs and .failures in construction of wall and
floor sections, air leakages through these sections. The effect of the
flanking transmission was also examined by the evaluation of both simulated
and in-situ data. The results were discussed to suggest some proper repair
solutions for the traditional timber-framed structures.