Floor Vibration
Originally published September 1975.
D.E. Allen and J.H. Rainer

People generally do not like floors to vibrate. In fact, noticeable vibration leads many to fear structural collapse, although such fear is unwarranted in most cases because of the small displacements and stresses produced. Noticeable vibration is nevertheless undesirable in many occupancies because of its adverse psychological effect. Recently, problems of annoying vibrations have increased with the development of floors of lighter construction, longer span, and less inherent damping. This Digest will discuss the nature of floor vibrations and how they affect people and structural safety. It will offer guidelines for design and for correcting unsatisfactory floors, and will discuss, briefly, vibrations of footbridges.

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