System Identification of Earth Dams Using Seismic Recordsby Mourad Zeghal, Princeton Univ, United States,
Ahmed M. Abdel-Ghaffar, Princeton Univ, United States,
Abstract: A technique to identify the elasto-plastic dynamic properties of earth dams and, therefore to asses the capabilities and limitation of their models, is developed. The technique is based on a combination of a prior, experimental and theoretical information. Earth dams are modeled as a three-dimensional nonhomogeneous elasto-plastic structures. Local-global finite element technique is used to solve the forward problem and the optimization aspect is handled with a quasi-Newton algorithm with a model-trust-region-strategy and a secant approximation to the Hessian matrix. Application to the well instrumented Long Valley earth dam, using the 1980 series of earthquake records, showed insufficiency of hysteretic damping to fully account for the system dissipation mechanisms.
Subject Headings: Earthfill dams | Elastoplasticity | Dynamic properties | Hydraulic models | Three-dimensional models | Optimization models | Earthquakes
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