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Analysis of Pacoima Dam Using Recently Recorded Seismic Motions : Report on Progress

by John Hall and Steven Alves

Hall, John, and Steven Alves (2002). Analysis of Pacoima Dam Using Recently Recorded Seismic Motions : Report on Progress. SMIP02 Seminar on Utilization of Strong-Motion Data, p. 97 - 114.

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Abstract

Ground and structure motions were recorded on 17 channels at Pacoima Dam during a magnitude 4.3 earthquake on January 13, 2001. These data are examined by system identification and finite element modeling to quantify the effects of nonuniform ground motion and the level of damping exhibited by the dam. The system identification study indicates the dynamic response of the dam is due mostly to two modes which have frequencies close to 5hz and damping in the range of 4% to 7% of critical. The displacement histories of the dam are reproduced fairly well by the finite element model, but differences in amplitudes for some of the channels remain to be resolved. In addition, more work is needed to obtain confidence in the results, especially the relatively high level of damping which seems to be present.