Seismic Behavior of Small-Scale Basin Using Centrifuge Testing

Abstract eng:
The lifeline facilities revealed high damage ratio in the vicinity of small-scale basin (scales in tens of meters). To explain the reasons of observed damage, the site response due to wave propagation in small-scale basin are numerically and experimentally investigated. A set of centrifuge tests is conducted on a simple small-scale basin model instrumented using 14 accelerometers. The accelerometers are placed at the base and top of the basin model in different distances and directions from the basin edge. The model is subjected to the different earthquake motions during centrifuge testing. Then, the site response at various locations is estimated using surface to base spectral ratio analysis in the frequency domain. The dominant frequencies and peak values vary significantly depending on the observation location to the basin edge. The amplification function within the basin edge show more peak frequencies with higher values than the others. The results of numerical analysis using 2D finite element computer program FILP agreed well with the experimental ones, certifying that the site amplification characteristics can be impacted by 2D effects of small-scale basin. The reasons are explained based on the coupling of shear waves propagating in different soil properties produced by 2D shape of small basin at close distance to the edge.

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