Soil-Structure Interaction During Earthquakes: Centrifuge Model Studies and Computer Analysis

摘要

A method for nonlinear dynamic effective stress analysis, applicable to soil-structure interaction problems, is described. Full interaction, including slip between structure and foundation, is taken into account. The major factors which must be considered when computing dynamic soil response are incorporated in the computer program TARA-2. Simulated earthquake tests were conducted on centrifuged geotechnical models to obtain prototype response data of foundation soils carrying both surface and embedded structures and to validate the dynamic effective stress analysis. Horizontal and vertical accelerations were measured at various points on structures and in the sand foundation. Seismically-induced porewater pressure changes were also measured at various locations in the foundation. Computer plots of the data were obtained while the centrifuge was in operation and representative samples are presented. A coherent picture of dynamic response of soil-structure systems is provided by dynamic effective stress nonlinear analysis. Accelerations, porewater pressures and settlements computed by TARA-2 compared favorably with those recorded during the centrifuge tests and all phenomenological aspects of dynamic response were reproduced by the analysis.