AcuWood Report 4, SP Report 2014:17
Multi-storey apartment houses or office buildings are more often built in timber construction in Europe. The reasons for this development are the sustainability of timber as building material, the development towards industrial pre-fabrication of constructional parts, and the related cost reduction in building construction. In the last few years, the construction of multi-storey timber buildings was principally facilitated by the approving authorities. The essential problem of fire protection has been solved in the meantime so that the construction of multi-storey apartment houses in timber construction is now possible. Therefore, acoustical problems are nowadays principal and decisive obstacles for multi-storey timber constructions.
Current requirements of multi-storey residential construction are based on the experience of massive construction, since multi-storey timber construction was not possible due to the requirements of fire protection until recently. The acoustic perception in buildings in lightweight construction is different in comparison to massive construction. Especially the impact sound transmission in the low frequency range gives rise to complaints in timber construction .
The currently used rating system for airborne and impact sound transmission in buildings was developed in the 1950s aiming at assessing the usual building constructions. In the following years, the constructions of residential and office buildings changed remarkably. In 1996, spectrum adaptation terms for airborne and impact sound insulation were introduced in ISO 717 [2, 3] allowing a modified rating method and the extension of the weighted frequency range to 50 Hz by adequate spectrum adaptation terms. By introducing multi- storey residential timber construction it became obvious that the currently used rating method without spectrum adaptation terms cannot avoid increased annoyance especially caused by impact sound. Therefore, the application of spectrum adaptation terms (with a frequency range down to 50 Hz) became more and more urgent. No reliable information, however, was available until this project was started, which requirement values for the normalized impact sound pressure level with spectrum adaptation term CI,50 – 2500 Hz shall be used. For a long time, it has been known that airborne sound transmission of timber floors is generally unproblematic, if impact sound insulation is sufficiently high. Therefore, the airborne sound insulation of the investigated floors was measured within the framework of the project, however, the focus and aims of the project were in the field of impact sound insulation. Special investigations of the vibration performance of floors were carried out in the affiliated project AkuLite in Sweden.
Thus, the project aim was to find improved technical rating methods for impact sound by correlating technical ratings with subjective ratings of impact sound. Accompanying questionnaires of residents of timber buildings were carried out to verify the statements of laboratory listening tests by field questionnaire results. In order to consider all currently used floor constructions a Fraunhofer Institute for Building Physics IBP AcuWood Report 4 5 massive concrete floor with floating cement screed was included besides various timber floors. This provided an additional data set of a reference floor, with which the timber floor results could be compared.
TräGuiden tillhandahåller information om trä och träbyggande. Webbsidan drivs av Svenskt Trä, en del av Skogsindustrierna, och utgör med sina nära en miljon besökare per år ett viktigt informationsnav för byggande i Sverige.
TräGuiden beskriver tekniska lösningar för träbyggande samt innehåller information om trämaterialets egenskaper. TräGuidens innehåll av illustrationer och konstruktionslösningar kan fritt skrivas ut eller delas med andra.
Det finns också nedladdningsbara ritningar i CAD-format på TräGuiden.
Du vet väl att du kan spara sidor till senare. Samla här pins för de sidor du besöker ofta och enkelt vill kunna återkomma till.
Ett enkelt sätt att spara dina pins är att maila dem
Du har nu skickat dina pins!
Något gick fel. Kontrollera e-postadressen och prova igen.