On the mobility of joist floors and periodic rib-stiffened plates

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ConferenceInter-noise 2007: 28 August 2007, Istanbul, Turkey
Pages110; # of pages: 10
Subjectflanking, model, prediction, impact sound; Floors
AbstractThis paper presents measured and predicted mobilities for two types of point-excited periodic structures. The first is constructed from an isotropic material (Plexiglas) and the connection between the rib and plate reasonably approximates a line (over the frequencies of interest). The second is a real joist floor where the orthotropic wood products forming the sheathing and ribs are point-connected (over much of the frequency range of interest). The paper begins by showing for both structures there is significant variation in the drive point mobility with position, and that the drive point mobility is bounded. An infinite plate defines the upper bound while a beam of infinite length defines the lower bound. Additionally, when the drive point is above a rib the location relative to the adjacent screws becomes an important factor. Thus, ordinary mobilities for an infinite plate and beam are inadequate to accurately model the system. The plate rib structure is also modelled using the analytical formulation for an assembly of finite-sized plate strips coupled at a series of parallel junctions. There is good agreement between the predicted drive point mobility and measurements in the frequency range where the plate rib junctions approximate a line connection.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number49694
NPARC number20377479
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Record identifier926e4d89-bdac-4761-9c4c-29ebea2228c2
Record created2012-07-24
Record modified2016-05-09
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