Time-domain identification of dynamic properties of layered soil by using extended Kalman filter and recorded seismic data |
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| Authors: | Zheng Yibin Mansheng Wang Liu He Yao Ying Xiyuan Zhou |
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| Institution: | University of Virginia, Charlottesville.VA 22904-4743.USA;Institutte ofGeophysics.China Earthquake Administration, Beijing 100036, China;University of Alaska, Anchorage.USA;Beijing University of Technology, Beijing 100083, China |
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| Abstract: | A novel time-domain identification technique is developed for the seismic response analysis of soil-structure interaction.
A two-degree-of-freedom (2DOF) model with eight lumped parameters is adopted to model the frequencydependent behavior of soils.
For layered soil, the equivalent eight parameters of the 2DOF model are identified by the extended Kaiman filter (EKF) method
using recorded seismic data. The polynomial approximations for derivation of state estimators are applied in the EKF procedure.
A realistic identification example is given for the layered-soil of a building site in Anchorage, Alaska in the United States.
Results of the example demonstrate the feasibility and practicality of the proposed identification technique. The 2DOF soil
model and the identification technique can be used for nonlinear response analysis of soil-structure interaction in the time-domain
for layered or complex soil conditions. The identified parameters can be stored in a database for use in other similar soil
conditions. If a universal database that covers information related to most soil conditions is developed in the future, engineers
could conveniently perform time history analyses of soil-structural interaction. |
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| Keywords: | soil-structure interaction identification extended Kalman filter 2DOF model equivalent lumped parameters polynomial approximation seismic data |
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