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Dynamic Response Analyses of Cogswell Dam During the 1991 Sierra Madre and the 1987 Whittier Narrows Earthquakes

by R.W. Boulanger, J.D. Bray, S.M. Merry and L.H. Mejia

Boulanger, R.W., J.D. Bray, S.M. Merry and L.H. Mejia (1993). Dynamic Response Analyses of Cogswell Dam During the 1991 Sierra Madre and the 1987 Whittier Narrows Earthquakes. SMIP93 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 91 - 104.

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Abstract

The recorded strong motions at Cogswell Dm during the 1991 Sierra Madre and 1987 Whittier Narrows earthquakes provide a valuable opportunity to investigate and evaluate the accuracy and reliability of conventional geotechnical procedures for evaluation of the dynamic response characteristics of rockfill dams and dams with highly three-dimensional geometries. The Sierra Madre Earthquake (ML = 5.8) produced a significantly stronger level of shaking than the more distant 1987 Whittier Narrows Earthquake (ML = 5.9) and thus the recorded accelerograms provide an excellent opportunity to investigate the dynamic properties of the rockfill over the imposed range of earthquake loads.