TECHNICAL PAPERS
Apr 15, 2003

Effects of False Floors on Vibration Serviceability of Building Floors. II: Response to Pedestrian Excitation

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Publication: Journal of Performance of Constructed Facilities
Volume 17, Issue 2

Abstract

This is the second of two papers that present the results of a comprehensive and systematic study into the effects of false flooring on the vibration serviceability of long-span concrete floors. In this paper, controlled pedestrian response measurements were utilized to determine the effects of the installation of false flooring on the vibration serviceability of long-span concrete floors. It was found that, in most cases, the installation of false flooring tended to reduce the measured vibration response of the floor under controlled pedestrian excitation. This was more significant for false floors with a relatively high finished floor height (FFH) than for floors with a lower finished floor height. It is tentatively proposed that the effects of false flooring be incorporated into existing design procedures by multiplying calculated responses by a vibration response reduction factor. This factor would be 0.9 for false flooring with FFH less than 500 mm or 0.8 for false flooring with FFH of 500 mm or greater.

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References

Bachmann, H., and Ammann, W. (1987). Vibrations in structures—Induced by man and machines, IABSE, Zürich, Switzerland.
Caverson, R. G. (1992). “Vibration characteristics of suspended concrete slabs.” MSc thesis, University of Bristol, U.K.
Eriksson, P-E. (1994). “Vibration of low-frequency floors—Dynamic forces and response prediction.” PhD thesis, Chalmers University of Technology, Göteborg, Sweden.
ISO. (1997). “Mechanical vibration and shock—Evaluation of human exposure to whole-body vibration—Part 1: General requirements.” ISO2631, Geneva, Switzerland.
Osborne, K. P., and Ellis, B. R.(1990). “Vibration design and testing of a long-span lightweight floor.” Struct. Eng., 68(10), 181–186.
Pavic, A. (1999). “Vibration serviceability of long-span cast in-situ concrete floors.” PhD thesis, University of Sheffield, U.K.
Pavic, A., and Reynolds, P.(1999). “Experimental assessment of vibration serviceability of existing office floors under human-induced excitation.” Exp. Tech., 23(5), 41–45.
Pernica, G.(1990). “Dynamic load factors for pedestrian movements and rhythmic exercises.” Can. Acoust., 18(2), 3–18.
Reynolds, P. (2000). “The effects of raised access flooring on the vibrational performance of long-span concrete floors.” PhD thesis, University of Sheffield, U.K.
Reynolds, P., and Pavic, A.(2003). “Effects of false floors on vibration serviceability of building floors. I: Modal properties.” J. Perform. Constr. Facil., 17(2), 75–86.
Ungar, E. E., and White, R. W.(1979). “Footfall-induced vibrations of floors supporting sensitive equipment.” Sound Vib., 10–13.
Williams, M. S., and Falati, S. (1999). “Modal testing of a post-tensioned concrete model floor slab.” Proc., 17th Int. Modal Analysis Conf., Society for Experimental Mechanics, Kissimmee, Fla., 14–20.
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Go to Journal of Performance of Constructed Facilities
Journal of Performance of Constructed Facilities
Volume 17Issue 2May 2003
Pages: 87 - 96

History

Received: Sep 10, 2001
Accepted: Jul 9, 2002
Published online: Apr 15, 2003
Published in print: May 2003

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P. Reynolds
Lecturer, The Univ. of Sheffield, Dept. of Civil and Structural Engineering, Sir Frederick Mappin Building, Sheffield, S1 3JD, U.K.
A. Pavic
Senior Lecturer in Structural Engineering, The Univ. of Sheffield, Dept. of Civil and Structural Engineering, Sir Frederick Mappin Building, Sheffield, S1 3JD, U.K.

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