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Framed Floor System Vibration - Human Perception vs. Equipment Sensitivity

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Framed Floor System Vibration - Human Perception vs. Equipment Sensitivity:

 

Running the numbers on a composite beam, framed floor system typically involves estimating a percentage of the live load present.  The greater the percentage assumed the lower the frequency and the less likely the perceptibility per the Reiher-Meister Scale.  Increasing the percentage of live load to reduce vibration velocity calculated for equipment sensitivity has just the opposite effect as the corresponding reduction in the frequency results in an increase in the velocity per the formulas provided in the AISC Design Guide 11.  This seems counter intuitive except the Design Guide does state that “human perception of vibration depends on how the vibration varies with time…the adverse effect of vibrations on sensitive equipment…is independent of…time variation.”

 

Any comments?

 

D. Matthew Stuart, P.E., S.E.

MASCE/SEI/BPAD

Senior Project Manager

Schoor DePalma Engineers and Consultants

200 State Highway Nine

Manalapan, NJ 07726

732-577-9000 (Ext. 1283)

732-431-9428 (Fax)

908-309-8657 (Cell)

mstuart(--nospam--at)schoordepalma.com