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

DIVISION OF ENGINEERING, CALIFORNIA INSTITUTE OF TECHNOLOGY,, PASADENA.
DEPARTMENT OF CIVIL ENGINEERING & MECHANICS, MONTANA STATE COLLEGE,, BOZEMAN.
DEPARTMENT OF CIVIL ENGINEERING, UNIVERSITY OF SOUTHERN CALIFORNIA,, LOS ANGELES.

Abstract

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.

This article has been cited by other articles:

				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]