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Vibration properties of a timber floor assessed in laboratory and during construction
Technical Research Institute of Sweden, SP Wood Technology, Vidéum Science Park,Växjö. (Träbyggnadsteknik)
University of Southern Denmark, Denmark. (Träbyggnadsteknik)ORCID iD: 0000-0003-2025-7842
Linnaeus University, Faculty of Technology, Department of Building Technology. (Träbyggnadsteknik)
2015 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 82, 44-54 p.Article in journal (Refereed) Published
Abstract [en]

Natural frequencies, damping ratios and mode shapes of a prefabricated timber floor element have been assessed experimentally in laboratory with different boundary conditions and in situ (in field) at different stages of construction. In laboratory the change in modal parameters was studied with free-free boundary conditions and simply supported on two sides. Three different simply supported tests with changes in boundary conditions were carried out; the floor placed on the support without any fastening or interlayer between support and floor, the floor screwed to the supports and the floor placed on an elastic interlayer between support and floor. The in situ tests were carried out first on the single floor element and then on the entire floor of the room into which the floor element was built in. The damping ratio of the floor increased from 1% to 3% when simply supported in laboratory to approximately 5% when placed upon a polyurethane interlayer (Sylodyn) in situ, and to approximately 6% when fully integrated in the building. Thus the in situ conditions have considerable influence on the damping and the values assessed are very high in comparison with damping values suggested in design codes. Regarding natural frequencies it was concluded that the major change in these occur as the floor element is coupled to the adjacent elements and when partitions are built in the studied room, the largest effect is on those modes of vibration that are largely constrained in their movement.

Place, publisher, year, edition, pages
2015. Vol. 82, 44-54 p.
Keyword [en]
Timber floor Wooden floor Vibration Damping Frequency Mode shape Modal analysis
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-37983DOI: 10.1016/j.engstruct.2014.10.019ISI: 000346545900005OAI: oai:DiVA.org:lnu-37983DiVA: diva2:760232
Available from: 2014-11-03 Created: 2014-11-03 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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  • apa
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