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Determination of the natural periods of buildings

BUILDING PHYSICS SECTION DIVISION OF BUILDING RESEARCH NATIONAL RESEARCH COUNCIL, OTTAWA, Canada

Abstract

Random wind excitation has been used to find the first three modes of vibration of a nineteenstory building about the two major translational axes and the torsional axis of the building. Vibration records were obtained with Willmore electromagnetic seismometers feeding into a multichannel magnetic tape recorder. A harmonic analysis was then performed with the aid of an analogue computer to determine the first few vibration modes. Concurrently with the experimental program the building modes were computed two ways using different simplifying assumptions regarding the lateral stiffness of the structure.

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				H. S. WARD and R. CRAWFORD Wind-induced vibrations and building modes Bulletin of the Seismological Society of America, August 1, 1966; 56(4): 793 - 813. [Abstract] [PDF]