Seismic soil structure interaction: a parametric study on shallow foundations
ESCOFFIER ; CHAZELAS
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
francais
Auteur
ESCOFFIER ; CHAZELAS
Résumé / Abstract
Soil structure interaction, for case of a rectangular shallow foundation resting on dry sand, has been studied through seismic centrifuge tests. A parametric study has been performed on two buildings having the same fixed based frequency with a different total weight. The lighter building induced a bearing pressure of 100 kPa and the heavier a bearing pressure of 300 kPa. Their bearing capacity and safety factor were first determined through static tests. In a second stage a parametric study has been performed to highlight the influence of the soil density, the frequency and the magnitude of the input motion, and the bearing pressure on the soil structure interaction. This analysis was based on the moment-rotation loops that illustrate the damping and the stiffness of the soil-structure system in the rotational mode. Moment-rotation loops were obtained based on a validated double integration process. The proven reproducibility of the tests enabled the comparison of soil-structure interaction between both buildings. Results highlighted that the effect of the soil density on the soil structure interaction was not relevant for the configurations tested. On the contrary, the frequency content and the amplitude of the input, such as the bearing pressure, highly influenced the soil structure interaction. However, for these three parameters, effects of the variation of one of them on the moment rotatio loop were influenced by the value of the other two parameters.
