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A new method for the measurement of the natural periods of buildings

Hudson, D. E. and Keightley, W. O. and Nielsen, N. N. (1964) A new method for the measurement of the natural periods of buildings. Bulletin of the Seismological Society of America, 54 (1). pp. 233-241. ISSN 0037-1106.

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It is shown that the inertia force obtained by a man moving his body back and forth in synchronism with the natural period of vibration of a large structure is sufficient to build up a measurable amplitude of motion. By recording such structural vibrations versus time, the natural period and damping of several of the lower modes of vibration can be determined. The amplitudes of motion set up in this way are for many structures significantly larger than can be obtained from wind excitation, which has been used in the past for the measurement of the period of the fundamental mode.

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Additional Information:Copyright © 1964, by the Seismological Society of America. Manuscript received July 15, 1963. Thanks are expressed to William K. Cloud, Chief of the Seismological Field Survey, United States Coast and Geodetic Survey, for assistance with the period measurements of the Encino Tower, which was made available for testing through the cooperation of the Los Angeles Department of Water & Power. We also wish to thank Francis E. Lehner of the Seismological Laboratory, California Institute of Technology, whose assistance made possible the adaptation of the lunar seismograph to this investigation, and Professor C. F. Richter of the Seismological Laboratory for information on the 28 February 1963 earthquake.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47798
Deposited By: George Porter
Deposited On:01 Aug 2014 18:19
Last Modified:03 Oct 2019 06:57

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