Some Passive Damping Sources on Flooring-Systems besides the TMD
Impulsive loads and walking loads can generate problematic structural vibrations in flooring-systems. Measures that may be taken to mitigate the problem would often be to consider the implementation of a tuned mass damper or even more advanced vibration control technologies; this in order to add damping to the structure. Basically also passive humans on a floor act as a damping source, but it also turns out from doing system identification tests with a floor strip that a quite simple set-up installed on the floor (cheap and readily at hand) might do a good job in terms of reducing vertical floor vibrations for some floors. The paper describes the tests with the floor strip, and the results, in terms of dynamic floor behaviour, are compared with what would be expected had the floor instead been equipped with a tuned mass damper.
Unable to display preview. Download preview PDF.
- 1.Ellis, B.R., On the response of long-span floors to walking loads generated by individuals and crowds, The Structural Engineer, Vol. 78 (10), pp. 1–25, 2000Google Scholar
- 2.Falati, S., The contribution of non-structural components to the overall dynamic behaviour of concrete floor slabs, Ph.D.-thesis, University of Oxford, Oxford, UK, 1999Google Scholar
- 3.Ellis, B.R., and Ji. T., Human-structure interaction in vertical vibrations, Proceedings of the ICE: Structures and Buildings, Vol. 122, pp.1-9, 1997Google Scholar
- 4.Reynolds, P., Pavic, A., and Ibrahim, Z., Changes of modal properties of a stadium structure occupied by a crowd, 22nd International Modal Analysis Conference (IMAC XXII), Dearborn, Detroit, USA, 2004Google Scholar
- 5.Pedersen, L. Updating of the dynamic model of floors carrying stationary humans, Proceedings of the 1st IOMAC, edited by Rune Brincker and Nis Møller, Copenhagen, pp. 421–428, 2005Google Scholar
- 6.Sachse, R., Pavic, A., and Prichard, S., The Influence of a Group of Humans on Modal Properties of a Structure, Structural Dynamics – EURODYN2002, Grundmann & Schuëllers (eds), Swets & Zeitlinger, Lisse, ISBN 90 5809 510 X, pp.1241-1246, 2002Google Scholar
- 7.Pedersen, L. Damping added to floors by seated crowds of people, SPIE’s Proceeding of 13th Annual Conference on Smart Structures and Materials, Damping and Isolation, San Diego, California, USA, 2006Google Scholar
- 8.Bachmann, H., and Weber, B., Tuned mass absorbers for ″lively″ structures, Structural Engineering International, Journal of IABSE, Vol. 5, No. 1, pp. 31–36, 1995Google Scholar
- 9.Reynolds, P., Diaz, I.M., and Nyawako, D., Vibration testing and active control of an office floor, 27th International Modal Analysis Conference (IMAC XXVII), Orlando, Florida, USA, 2009Google Scholar
- 10.Hartog, J.P., Mechanical Vibration, 4th edn, McGraw-Hill, New York, 1956Google Scholar