Effects of False Floors on Vibration Serviceability of Building Floors. I: Modal Properties
This article has a reply.
VIEW THE REPLYPublication: Journal of Performance of Constructed Facilities
Volume 17, Issue 2
Abstract
This is the first 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, advanced modal testing technology was utilized to determine modal properties of long-span concrete floors (natural frequencies, modal damping ratios, and mode shapes) before and after the installation of false flooring. It was found that false flooring had the capacity to change modal properties significantly, particularly modal damping ratios, which had increases of up to 89%. Parametric studies using updated finite element models were also performed, which showed that the false flooring contributed also to floor stiffness. However, changes in modal properties were not consistent across all modes of vibration and it was not possible to predict easily which modes would be affected beneficially by the installation of false flooring.
Get full access to this article
View all available purchase options and get full access to this article.
References
Allen, D. L. (1974). “Vibrational behavior of long-span floor slabs.” Proc., Canadian Structural Engineering Conf., Canadian Steel Industries Construction, Council, Ont., Canada, 1–19.
Allen, D. E., and Rainer, J. H. (1975). “Floor vibration.” Canadian Building Digest No. 173, Division of Building Research, National Research Council of Canada, Ottawa, 1–4.
Allen, D. E., and Rainer, J. H.(1976). “Vibration criteria for long-span floors.” Can. J. Civ. Eng., 3(2), 165–173.
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.
Ewins, D. J. (2000). Modal testing: Theory, practice and application, Research Studies Press, Baldock, U.K.
Imperial College Analysis and Testing Software (ICATS). (1997). Modent, Modesh, Modacq, Meshgen reference manual (version 6). London.
Lenzen, K. H. (1962). “Final report—Vibration of steel joist–concrete slab floor systems.” Studies in Engineering Mechanics Rep. No. 16, Center for Research in Engineering Science, University of Kansas, Lawrence, Kan.
Lenzen, K. H.(1966). “Vibration of steel joist–concrete slab floors.” J. Am. Inst. Steel Construct. Eng., 3, 133–136.
Lenzen, K. H., and Murray, T. M. (1969). “Vibration of steel beam–concrete slab floor systems.” Studies in Engineering Mechanics Rep. No. 29, Center for Research in Engineering Science, University of Kansas, Lawrence, Kan.
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., Waldron, P., and Reynolds, P. (1998). “Vibration of post-tensioned concrete floor slabs.” Dept. of Environment Transport and the Regions (DETR) Partners in Technology (PiT) Contract Reference CI 39/3/393(cc0952) Final Rep., University of Sheffield, U.K.
Pernica, G.(1987). “Effect of architectural components on the dynamic properties of a long-span floor system.” Can. J. Civ. Eng., 14(4), 461–467.
Rainer, J. H., and Pernica, G. (1981). “Damping of a floor sample.” Proc., 2nd Specialty Conf. on Dynamic Response of Structures, ASCE, Reston, Va., 859–873.
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.(2000). “Quality assurance procedures for the modal testing of building floor structures.” Exp. Tech., 24(3), 36–41.
Reynolds, P., and Pavic, A.(2003). “Effects of false floors on vibration serviceability of building floors. II. Response to pedestrian excitation,” J. Perform. Constr. Facil., 17(2), 87–96
Reynolds, P., Pavic, A., and Waldron, P. (1998). “Model testing, FE analysis and FE model correlation of a 600 tonne post-tensioned concrete floor.” 23rd Int. Seminar on Modal Analysis, Dept. of Mechnaical Engineering, Katholieke Universiteit Leuven, Leuven, Belgium, 1129–1136.
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.
Williams, M. S., and Waldron, P.(1994). “Evaluation of methods for predicting occupant-induced vibrations in concrete floors.” Struct. Eng., 72(20), 334–340.
Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 17 • Issue 2 • May 2003
Pages: 75 - 86
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Sep 10, 2001
Accepted: Jul 9, 2002
Published online: Apr 15, 2003
Published in print: May 2003
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.