Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; December 1966; v. 56; no. 6; p. 1207-1226
© 1966 Seismological Society of America
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Vibrational characteristics of an earth dam

W. O. KEIGHTLEY

DEPARTMENT OF CIVIL ENGINEERING AND ENGINEERING MECHANICS MONTANA STATE UNIVERSITY, BOZEMAN, MONTANA

Abstract

An earth dam was excited into vibrations, in the upstream-downstream direction, by four rotating eccentric-mass vibration generators which were operated on the crest. Natural frequencies, mode shapes, and equivalent viscous modal damping constants of the dam were revealed by the forced vibrations. A theoretical analysis of the dam, based on consideration of shearing deformations only, shows moderately good agreement with the behavior which was observed at the lower frequencies.






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