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Organization Title

Nonlinear Dynamic Response Analysis of Lexington Dam

by L.H. Mejia, J.I. Sun, S. Salah-mars, Y. Moriwaki and M. Beikae

Mejia, L.H., J.I. Sun, S. Salah-mars, Y. Moriwaki and M. Beikae (1992). Nonlinear Dynamic Response Analysis of Lexington Dam. SMIP92 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 10-1 - 10-14.

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Abstract

The site response to strong and weak ground motion depends largely on the subsurface conditions at the soil site for the two rock-soil station pairs studied. The first station pair consists of a soft-soil site and a sandstone/shale site (Treasure Island and Yerba Buena Island). For strong motion, the soft-soil site is amplified by a factor of about 3 over the rock site from 0.5 to 2.0 Hz. The amplification is much higher for weak motion and suggests a dependence on signal amplitude.

A second station pair near Gilroy consisting of a stiff-soil site and a sandstone site was studied with contrasting results. Unlike the results for the soft-soil study above, the estimated stiff-soil site response is not significantly different for strong and weak motion from 0.5 to 2.0 Hz.