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Effect of flexible supports on vibration performance of timber floors
SP Wood Technology, SP Technical Research Institute of Sweden.
Linnaeus University, Faculty of Science and Engineering, School of Engineering.
Linnaeus University, Faculty of Science and Engineering, School of Engineering.
University of Southern Denmark, Denmark.ORCID iD: 0000-0003-2025-7842
2012 (English)In: Euronoise, Prague 2012, 10-13 June, 2012: Proceedings, European Acoustics Association (EAA), 2012, 214-219 p.Conference paper, Published paper (Refereed)
Abstract [en]

In residential multi-storey buildings of timber it is of great impor-tance to reduce the flanking transmission of noise. Some buildingsystemsdothisbyinstallingavibration-dampingelasticinterlayer,Sylomerror Sylodynr, in the junction between the support andthefloorstructure.Thisinterlayeralsoimprovesthefloorvibrationperformance by adding damping to the structure. In the presentwork the vibration performance of a floor with such interlayershas been investigated both in laboratory and field tests. A pre-fabricated timber floor element was tested in laboratory on rigidsupports and on supports with four different types of interlayers.Theresultsarecomparedwithin situtests on a copy of the samefloorelement.Theeffectonvibrationperformancei.e.frequencies,damping ratio and mode shapes is studied. A comparison of theinsitutestandthetestwithelasticinterlayerinlaboratoryshowsthatthe dampingin situis approximately three times higher than on asingle floor element in the lab. This indicates that the dampinginsituisaffectedbethesurroundingbuildingstructure.Theachieveddamping ratio ishighly dependent onthe mode shapes. Mode sha-pes that have high mode shape coefficients along the edges wherethe interlayer material is located, result in higher modal dampingratios. The impulse velocity response, that is used to evaluatethe vibration performance and rate experienced annoyance in thedesign of wooden joist floors, seems to be reduced when adding elastic layers at the supports.

Place, publisher, year, edition, pages
European Acoustics Association (EAA), 2012. 214-219 p.
Series
Euronoise proceedings, ISSN 2226-5147
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-28050ISBN: 978-80-01-05013-2 (print)OAI: oai:DiVA.org:lnu-28050DiVA: diva2:640069
Conference
Ninth European Conference on Noise Control (Euronoise), Prague, 10-13 June, 2012
Available from: 2013-08-12 Created: 2013-08-12 Last updated: 2016-10-03Bibliographically approved
In thesis
1. Vibrations in timber floors: Dynamic properties and human perception
Open this publication in new window or tab >>Vibrations in timber floors: Dynamic properties and human perception
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Springiness and vibrations of timber floors are familiar to many as a ‘live’ feelwhen walking on them, especially if living in single family housing with timberframework. Since the building regulations in Sweden changed to performancedependentrequirements in 1994 the use of timber in multifamily housing hasincreased. New timber building systems have been developed and increasedbearing capacity of floors has made it possible to build with longer spans. Thelow mass of timber floors makes them more sensitive to dynamic loading byhuman activities, such as walking, running and jumping, compared to heavyfloors e.g. concrete floors. To improve vibration performance it is possible tochange the structural properties of the floors by increasing mass, stiffness ordamping properties. The most practicable solution is to increase the stiffness.Improved damping is also highly effective, but is difficult estimate and designaccurately since it originates from many sources in the finished building. In thepresent thesis the effects on dynamic properties from increased stiffnesstransverse to the load bearing direction of a floor have been assessed from testsin laboratory. The effect on dynamic performance of a timber floor fromelastic/damping interlayers (polyurethane elastomers) installed in the junctionsbetween walls and floors have been assessed in laboratory and in situ. Also thechange in dynamic properties of an in situ floor has been investigated atdifferent stages of construction and compared with results from laboratory tests.The present criteria for design of timber floors with respect to vibrationperformance were developed at a time when timber floors were mainly used insingle-family housing. The traditional timber joist floors differ in structuralbehaviour from the new types of floors developed recently. The experiencedvibration annoyance by residents in single- and multifamily housing differs asthe source of vibration disturbance and those who become disturbed aredifferent. The changed conditions give cause for a review of present designcriteria. A laboratory and field study on vibration performance was conductedwith questionnaires and dynamic performance measurements. The subjectiveand objective results were correlated and indicators for vibration acceptabilityand annoyance were assessed and new vibration performance criteria andvibration performance classes were suggested.

Place, publisher, year, edition, pages
Kalmar, Växjö: Linnaeus University Press, 2014. 64 p.
Series
Linnaeus University Dissertations, 195/2014
Keyword
wooden floor, timber floor, vibration, design criteria, damping, frequency, questionnaire, field test, socio-vibrational survey, vibration annoyance, vibration disturbance
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-39305 (URN)978-91-87925-23-8 (ISBN)
Public defence
2014-11-07, N1017, hus N, Växjö, 10:00 (English)
Opponent
Supervisors
Available from: 2015-01-21 Created: 2015-01-21 Last updated: 2015-01-21Bibliographically approved

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Citation style
  • apa
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