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Psycho-vibratory evaluation of timber floors: Towards the determination of design indicators of vibration acceptability and vibration annoyance
Lund University.
Lund University.
SP Technical Research Institute of Sweden, Vidéum Science Park, Växjö.
SP Technical Research Institute of Sweden, Vidéum Science Park, Växjö.
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2015 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 340, 383-408 p.Article in journal (Refereed) Published
Abstract [en]

In timber housing constructions, vibrations can be a nuisance for inhabitants. Notably, the vibrational response of wooden floor systems is an issue in need of being dealt with more adequately in the designing of such buildings. Studies addressing human response to vibrations are needed in order to be able to better estimate what level of vibrations in dwellings can be seen as acceptable. In the present study, measurements on five different wooden floors were performed in a laboratory environment at two locations in Sweden (SP in Växjö and LU in Lund). Acceleration measurements were carried out while a person either was walking on a particular floor or was seated in a chair placed there as the test leader was walking on the floor. These participants filled out a questionnaire regarding their perception and experiencing of the vibrations in question. Independently of the subjective tests, several static and dynamic characteristics of the floors were determined through measurements. The ultimate aim was to develop indicators of human response to floor vibrations, specifically those regarding vibration acceptability and vibration annoyance, their being drawn based on relationships between the questionnaire responses obtained and the parameter values determined on the basis of the measurements carried out. To that end, use was made of multilevel regression. Although the sample of floors tested was small, certain clear trends could be noted. The first eigenfrequency (calculated in accordance with Eurocode 5) and Hu and Chui׳s criterion (calculated from measured quantities) proved to be the best indicators of vibration annoyance, and the Maximum Transient Vibration Value (computed on the basis of the accelerations experienced by the test subjects) to be the best indicator of vibration acceptability.

Place, publisher, year, edition, pages
2015. Vol. 340, 383-408 p.
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-39303DOI: 10.1016/j.jsv.2014.12.001OAI: oai:DiVA.org:lnu-39303DiVA: diva2:782498
Available from: 2015-01-21 Created: 2015-01-21 Last updated: 2015-01-21Bibliographically 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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