While a large number of dynamic 1-g model tests on homogeneous soil deposits has been reported, experimental data on layered deposits is scarce. This paper investigates the seismic free field response of two stratified deposits of dry granular materials, with different impedance ratios between the top and the bottom layers. The deposits were contained in a laminar shear box and tested dynamically on a shaking table. The decoupled fundamental periods of the individual layers were measured by modal testing and the results were employed in the calculation of the fundamental period of the overall profile by an extended variant of the Madera procedure. Dynamic measurements of shearing stress and strain provide useful insight into how the strain magnitude and the earthquake frequency content affect the hysteretic response of the test media. A comparison is made between the measured dynamic stiffness and the values given by empirical strain curves for sands. The performance of the enclosing container is also discussed.
|Titolo:||Shaking table testing of free field response in layered granular deposits|
|Data di pubblicazione:||2016|
|Appare nelle tipologie:||1.1 Articolo in rivista|