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- W19162203 abstract "System identification techniques are employed to characterize the stiffness and damping characteristics of a dense sand stratum at low dynamic excitation conditions. The identification process utilizes a large database of input-output accelerations recorded in a highly instrumented centrifuge experimental program conducted by researchers at the University of California at Davis. This paper presents a computational effort based on the recorded small shaking events, where the peak ground surface acceleration ranges from 0.05g to 0.196g in amplitude. The dynamic behavior of the prototype stiff soil site near its first resonance is modeled by that of a one-dimensional shear beam. An employed system identification process attempts to define the shear wave velocity profile and damping that provide a best match to the experimental dynamic soil response near the first resonance, along a central downhole accelerometer array. Both linear viscous and hysteretic soil models are utilized in this identification study. The identified properties are found to be consistent among the investigated events, and are in good agreement with other laboratory estimates. The calibrated (via system identification) shear beam predications were found to be an excellent match to those recorded at all central downhole accelerometer locations around the first resonance. INTRODUCTION 1994). The FSB container dimensions are 1.65 Im x 0.787~ x 0.584m in length, width and height respectively. Nevada sand at A highly instrumented centrifuge test was conducted to study the linear and nonlinear behavior of stiff soil sites during earthquakes at the University of California at Davis (UCD). The experiment employed a Flexible Shear Beam (FSB) container mounted on the 9m-radius geotechnical centrifuge at UCD (Kutter et al. about 100% relative density was used to represent the stiff soil. Numerous accelerometers were installed to document the horizontal and vertical responses of the model (Fig. 1). The configuration of the FSB container and locations of the installed accelerometers are illustrated in Fig. 1." @default.
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- W19162203 date "2001-01-01" @default.
- W19162203 modified "2023-09-27" @default.
- W19162203 title "Identification of Small Strain Dynamic Properties of Dense Sand" @default.
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