This paper brings to discussion the sound insulation of a special type of glazing by studying a S(inusoidal)shaped curved glass. This has been used in a concert hall (under construction) in Portugal with a forwardthinking Rem Koolhaas's architecture requiring non-standard solutions: glazing with very large dimensions (22 m by 15 m) and each "S-glass panel" with a wavelength of about 1.0 m and an amplitude of about 0.35 m will be applied as a double facade. The restrictions in ISO 104-3 laboratory measurements (standard test opening for glazings 1.25 m by 1.50 m and niche depth of 0.45 m) were not appropriate and not completely fulfilled due to differences in dimensions between the small standard test sample and the real required ones used on site as well as the silicone joints that connect the glass elements in their frame. For these reasons, the standard laboratory test opening of 10 m 2 was used. These aspects are described and analyzed. The tests results (showing satisfactory sound insulation) were essential to understand the effect of the shape and the efficiency of the glass. This study aspires to be helpful to building designers who can, in this way, lose dependency on production process constraints and bring into being all kind of shapes.
This paper presents an overview of gymnasiums’ acoustic problems when used for aerobics exercises classes (and similar) with loud noise levels of amplified music. This type of gymnasium is usually a highly reverberant space, which is a consequence of a large volume surrounded by hard surfaces. A sample of five schools in Portugal was chosen for this survey. Noise levels in each room were measured using a precision sound level meter, and analyzed to calculate the standardized daily personal noise exposure levels (LEP,d). LEP,d values from 79 to 91 dB(A) were found to be typical values in this type of room, inducing a health risk for its occupants. The reverberation time (RT) values were also measured and compared with some European legal requirements (Portugal, France, and Belgium) for nearly similar situations. RT values (1 kHz) from 0.9 s to 2.8 s were found. These reverberation time values clearly differentiate between good and acoustically inadequate rooms. Some noise level and RT limits for this type of environment are given and suggestions for the improvement of the acoustical environment are shown. Significant reductions in reverberation time values and noise levels can be obtained by simple measures.
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