Effect of architectural components on the dynamic properties of a long-span floor system

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Journal titleCanadian Journal of Civil Engineering
Pages461467; # of pages: 7
Subjectcomposite floors; vibration control; tests; resonant frequencies; acceleration meters; building dynamics; vibration measurements; modal frequency; modal damping ratio; mode shape; fundamental frequency; static load; internal partition; full- span partition; damping ratios; composite structures; vibration tests; spectrum analysis; resonant frequency; vibration damping; contrôle des vibrations; essai; fré quence de resonance; acceleromètre; dynamique des constructions
AbstractVibration measurements were taken to determine the effects of architectural components on the dynamic properties (modal frequency, modal damping ratio, and mode shape) of a long- span floor system. The floor was located above a two-storey gymnasium in a recently constructed three-storey elementary school. The dynamic properties of the bare floor system were measured during the construction phase, immediately after the main structural components and the exterior masonry walls were in place. Six months later, with construction completed and the school ready for occupancy, the properties of the finished floor system, complete with internal partitions, mechanical ducts, furnishings, and carpeting, were again obtained. A comparison of the results of the two test series indicated that the dynamic properties of the floor system were altered by the addition of the architectural components. The fundamental frequency rose by 3% and the frequencies of the higher modes by 23%, even though the static load on the floor increased by about 26%. The substantial stiffening of the floor system necessary to precipitate these increases in frequency was linked to the presence of the internal partitions. A full-span partition was also found to behave as a floor support, creating an additional set of modes which were not previously present. Except for the fundamental mode, damping ratios increased by about 2% of critical, from 1.5% to 3.5% of critical. For the fundamental mode, the negligible increase in damping from 4.1 to 4.2% of critical could not be explained.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number28772
NPARC number20377627
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Record identifierd788bfdc-c617-4d39-91c3-57b2389c1e80
Record created2012-07-24
Record modified2016-05-09
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