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- Title
COMPARISON OF GROUND MOTION ESTIMATION METHODS ON EMBANKMENT DAM DEFORMATION.
- Authors
MAKI, IAN P.; LUTZ, ANDREW T.
- Abstract
The California Division of Safety of Dams (DSOD) commonly uses several intensity measures when selecting and modifying acceleration time histories for seismic analysis of dams. Target values can be estimated for Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV), Arias Intensity (AI), Significant Duration (D595), Spectral Acceleration (SA) at the period of the structure, and other parameters. This paper examines two methods for developing a suite of input records, and how the analysis results compare for each method. DSOD performs both linear and non-linear seismic analyses on all types of concrete dams, appurtenant structures, and embankments. Common strategies for developing analysis time histories start by selecting seed records from recorded ground motions with characteristics similar to the design earthquake. Seed records are then adjusted by either scaling them linearly or by manipulating the frequency content using spectral matching techniques. Spectral matching is an efficient technique for calculating the expected performance, and linear scaling can provide an appreciation for the expected variability. This paper compares embankment deformations using design ground motions generated by these two different approaches. The maximum deformation results from three spectrally matched ground motions are compared to the average results from seven linearly scaled ground motions. This comparison is presented for a generic zoned embankment dam with two different sets of material properties--one susceptible to liquefaction (assumed as a hydraulic fill dam) resulting in large deformations, and one not susceptible to liquefaction resulting in more modest deformations. These results are also compared to empirical Newmark relationship. In addition, two levels of reservoir are also compared.
- Subjects
DAM safety; EARTHQUAKE hazard analysis; DEFORMATIONS (Mechanics); RUPTURES (Structural failure); EMBANKMENTS
- Publication
Journal of Dam Safety, 2018, Vol 15, Issue 3, p9
- ISSN
1944-9836
- Publication type
Article