AkuLite Report 5, SP Report 2013:25
In lightweight housing constructions containing timber oors, vibrations can be a nuisance for inhabitants. The vibrational response of wooden oor systems is thus 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 ve dierent oors were performed in a laboratory environment at two locations in Sweden (SP in Vaxjo and LU in Lund). Acceleration measurements were carried out while a person either was walking on a particular oor or was seated in a chair placed there as the test leader was walking on the oor. These participants lled out a questionnaire regarding their perception and experiencing of the vibrations in question. Independent of the subjective tests, acceleration measurements were also carried out, using a shaker as a source of excitation, with the aim of determining the dynamic characteristics of the oors. Also, static load tests were performed using displacement gauges in order to measure the oor de ections. The ultimate aim of the study was to develop indicators of human response to oor vibrations, specically 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. The study rst presents a literature review of the topics dealt with, a description of the measurements performed, an analysis of the objective data obtained, as well as a classication of the oors in accordance with several dierent serviceability criteria. Subsequently, the statistical analyses performed to extract the vibration acceptability and annoyance indicators are described, use being made there of multilevel regression. Although the sample of oors tested was small (5 altogether), certain clear trends could be noted. In particular, the rst 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.
Keywords: Psycho-vibratory evaluation, Vibrations, Timber oors, Lightweight, Measurements, Serviceability criteria, Vibration annoyance, Vibration acceptability, Design indicators, Principal Component Analysis, Multilevel regression, Eurocode 5.
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