Geo-Institute (GI) Speaker Lunch

September 19, 2018
12:00 PM to 1:00 PM
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Old Spaghetti Factory
1910 J. Street
Sacramento, CA 95811

Join us for GI and EERI sponsored lunch!

In a seismic hazard assessment of an embankment dam, the ground motion intensity measure (IM) deemed important to the dam must first be identified (e.g., spectral acceleration, SA; peak ground velocity, PGV; and Arias intensity, AI). It is important for the IM to relate well to the engineering demand parameter (EDP) of interest. Results from a study are presented that had set out to identify IMs that related to embankment dam deformation. It was found from this study that AI most efficiently predicted embankment dam deformations, followed by CAV. In terms of SA-based IMs, T_s at short periods and then in the general range of the natural period of the dams was seen to be the most efficient SA-based IM. However, in almost all cases, the SA-based SAs were not as efficient as AI. Considering the relative merits of each IM in the context of a seismic hazard analysis, it is noted that the poor predictability of AI relative to other IMs resulted in a higher total uncertainty given an earthquake. Therefore, CAV was deemed the best IM.

Presenter: Richard Armstrong is an Assistant Professor in the Department of Civil Engineering at Sacramento State. His teaching and research focuses on geotechnical earthquake engineering and dam engineering. Prior to joining Sacramento State, he worked for six years as a water resource engineer at the California Division of Safety of Dams performing seismic evaluations of embankment dams as well as applied research work.

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