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Using the numerical analysis program FLAC to estimate the seismic response of soils has developed into a common practice for a wide range of projects. This practice began in the early 1990s as a means of evaluating complex site conditions and addressing limitations in traditional de-coupled analysis methods. But as the tools and modeling approaches have developed, so have the demands that are placed on the analysis results. This presentation will discuss current capabilities as well as limitations in seismic deformation analyses. Recommendations are provided for addressing significant limitations with the end goal of maximizing the usefulness of the analysis. A particular focus will be given to liquefaction of sands and cyclic softening behavior of plastic silts and clays. Several case histories will be used for illustration, including the evaluation of electrical transmission tower foundations near the Columbia River and the foundation for an elevated light rail line over soft soils in Vancouver, BC.
Dr. Michael Beaty has 29 years of experience specializing in geotechnical and earthquake engineering, numerical analysis, and soil-structure interaction. His work has focused primarily on dams (embankment, rockfill, and concrete), foundations, ground remediation, transportation, levees, and slopes. His use of the finite difference technique to analyze liquefaction and seismic deformation response includes co-authoring the UBCSAND constitutive model. Other analysis experience involves traditional liquefaction assessments, slope stability, dynamic site response, settlement, and seepage analyses. Michael has degrees in geotechnical and structural engineering from UC Berkeley (BS), UC Davis (MS), and the University of British Columbia (PhD). He is Principal Engineer of Beaty Engineering in Beaverton, Oregon.
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LocationRed Lion Hotel
11211 Main St
Bellevue, WA 98004
United States
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