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Building Design and Construction Handbook - Merritt - Ventech!

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5.188 SECTION FIVE<br />

distinctly perceptible, (3) strongly perceptible, (4) disturbing, <strong>and</strong> (5) very disturbing.<br />

The frequency <strong>and</strong> displacement ranges of the episodes were 5 to 70 Hz <strong>and</strong><br />

0.001 to 0.40 in, respectively.<br />

5.23 MURRAY CRITERION FOR<br />

WALKING VIBRATIONS<br />

5.23.1 Summary of the Criterion<br />

In the criterion presented by Murray, an acceptable steel floor system is predicted,<br />

with respect to vibration levels due to walking excitation, if the dynamic criterion<br />

below is met. This criterion is applicable to offices <strong>and</strong> residences with fundamental<br />

natural frequencies below 10 Hz.<br />

Murray criterion:<br />

D � 35A0ƒ � 2.5<br />

where D � damping in floor system, expressed as a percent of critical<br />

A 0 � maximum initial amplitude of the floor system due to a heel-drop excitation,<br />

in<br />

ƒ � first natural frequency of the floor system, Hz<br />

This criterion is only applicable for the units specified. The reader is cautioned<br />

against using other units.

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